Webster's Unabridged Dictionary - Letter R - Page 3
Radiant (a.) (Her.) Giving off rays; -- said of a bearing; as, the sun radiant; a crown radiant.
Radiant (a.) (Bot.) Having a raylike appearance, as the large marginal flowers of certain umbelliferous plants; -- said also of the cluster which has such marginal flowers.
Radiant (a.) (Physics) Emitted or transmitted by radiation; as, a radiant energy; radiant heat.
Radiant energy (Physics), Energy given out or transmitted by radiation, as in the case of light and radiant heat.
Radiant heat, Heat proceeding in right lines, or directly from the heated body, after the manner of light, in distinction from heat conducted or carried by intervening media.
Radiant point. (Astron.) See Radiant, n., 3.
Radiant (n.) (Opt.) 發光（或發熱）的物體，光點；（電爐等的）白熾部分 The luminous point or object from which light emanates; also, a body radiating light brightly.
Radiant (n.) (Geom.) A straight line proceeding from a given point, or fixed pole, about which it is conceived to revolve.
Radiant (n.) (Astron.) The point in the heavens at which the apparent paths of shooting stars meet, when traced backward, or whence they appear to radiate.
Radiant (a.) Radiating or as if radiating light; "the beaming sun"; "the effulgent daffodils"; "a radiant sunrise"; "a refulgent sunset" [syn: beaming, beamy, effulgent, radiant, refulgent].
Radiantly (adv.) In a radiant manner; with glittering splendor.
Radiary (n.) (Zool.) A radiate. [Obs.]
Radiata (n. pl.) (Zool.) An extensive artificial group of invertebrates, having all the parts arranged radially around the vertical axis of the body, and the various organs repeated symmetrically in each ray or spheromere.
Note: It includes the c[oe]lenterates and the echinoderms. Formerly, the group was supposed to be a natural one, and was considered one of the grand divisions of the animal kingdom.
Radiated (imp. & p. p.) of Radiate.
Radiating (p. pr. & vb. n.) of Radiate.
Radiate (v. i.) To emit rays; to be radiant; to shine.
Virtues shine more clear In them [kings], and radiate like the sun at noon. -- Howell.
Radiate (v. i.) To proceed in direct lines from a point or surface; to issue in rays, as light or heat.
Light radiates from luminous bodies directly to our eyes. -- Locke.
Radiate (v. t.) To emit or send out in direct lines from a point or points; as, to radiate heat.
Radiate (v. t.) To enlighten; to illuminate; to shed light or brightness on; to irradiate. [R.]
Radiate (a.) Having rays or parts diverging from a center; radiated; as, a radiate crystal.
Radiate (a.) (Bot.) Having in a capitulum large ray florets which are unlike the disk florets, as in the aster, daisy, etc.
Radiate (a.) (Zool.) Belonging to the Radiata.
Radiate (n.) (Zool.) One of the Radiata.
Radiate (a.) Arranged like rays or radii; radiating from a common center; "radial symmetry"; "a starlike or stellate arrangement of petals"; "many cities show a radial pattern of main highways" [syn: radial, stellate, radiate].
Radiate (a.) Having rays or ray-like parts as in the flower heads of daisies.
Radiate (v.) Send out rays or waves; "The sun radiates heat"
Radiate (v.) Out real or metaphoric rays; "She radiates happiness"
Radiate (v.) Extend or spread outward from a center or focus or inward towards a center; "spokes radiate from the hub of the wheel"; "This plants radiate spines in all directions" [syn: radiate, ray].
Radiate (v.) Have a complexion with a strong bright color, such as red or pink; "Her face glowed when she came out of the sauna" [syn: glow, beam, radiate, shine].
Radiate (v.) Cause to be seen by emitting light as if in rays; "The sun is radiating".
Radiate (v.) Experience a feeling of well-being or happiness, as from good health or an intense emotion; "She was beaming with joy"; "Her face radiated with happiness" [syn: glow, beam, radiate, shine].
Radiate (v.) Issue or emerge in rays or waves; "Heat radiated from the metal box".
Radiate (v.) Spread into new habitats and produce variety or variegate; "The plants on this island diversified" [syn: diversify, radiate].
Radiated (a.) Emitted, or sent forth, in rays or direct lines; as, radiated heat.
Radiated (a.) Formed of, or arranged like, rays or radii; having parts or markings diverging, like radii, from a common center or axis; as, a radiated structure; a radiated group of crystals.
Radiated (a.) (Zool.) Belonging to the Radiata.
Radiately (adv.) In a radiate manner; with radiation or divergence from a center.
Radiate-veined (a.) Having the principal veins radiating, or diverging, from the apex of the petiole; -- said of such leaves as those of the grapevine, most maples, and the castor-oil plant.
Radiatiform (a.) Having the marginal florets enlarged and radiating but not ligulate, as in the capitula or heads of the cornflower.
Radiation (n.) The act of radiating, or the state of being radiated; emission and diffusion of rays of light; beamy brightness.
Radiation (n.) The shooting forth of anything from a point or surface, like the diverging rays of light; as, the radiation of heat.
Radiative (a.) Capable of radiating; acting by radiation.
Radiator (n.) That which radiates or emits rays, whether of light or heat; especially, that part of a heating apparatus from which the heat is radiated or diffused; as, a steam radiator.
Radical (a.) Of or pertaining to the root; proceeding directly from the root.
Radical (a.) Hence: Of or pertaining to the root or origin; reaching to the center, to the foundation, to the ultimate sources, to the principles, or the like; original; fundamental; thorough-going; unsparing; extreme; as, radical evils; radical reform; a radical party.
Radical (a.) Belonging to, or proceeding from, the root of a plant; as, radical tubers or hairs.
Radical (a.) Proceeding from a rootlike stem, or one which does not rise above the ground; as, the radical leaves of the dandelion and the sidesaddle flower.
Radical (a.) Relating, or belonging, to the root, or ultimate source of derivation; as, a radical verbal form.
Radical (a.) Of or pertaining to a radix or root; as, a radical quantity; a radical sign. See below.
Radical (n.) A primitive word; a radix, root, or simple, underived, uncompounded word; an etymon.
Radical (n.) A primitive letter; a letter that belongs to the radix.
Radical (n.) One who advocates radical changes in government or social institutions, especially such changes as are intended to level class inequalities; -- opposed to conservative.
Radical (n.) A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom.
Radical (n.) Specifically, a group of two or more atoms, not completely saturated, which are so linked that their union implies certain properties, and are conveniently regarded as playing the part of a single atom; a residue; -- called also a compound radical. Cf. Residue.
Radical (n.) A radical quantity. See under Radical, a.
Radical (a.) A radical vessel. See under Radical, a.
Radicalism (n.) The quality or state of being radical; specifically, the doctrines or principles of radicals in politics or social reform.
Radicality (n.) Germinal principle; source; origination.
Radicality (n.) Radicalness; relation to a root in essential nature or principle.
Radicalize (v.) Make more radical in social or political outlook; "Her work in the developing world radicalized her".
Radically (adv.) In a radical manner; at, or from, the origin or root; fundamentally; as, a scheme or system radically wrong or defective.
Radically (adv.) Without derivation; primitively; essentially. [R.]
These great orbs thus radically bright. -- Prior.
Radically (adv.) In a radical manner; "she took a radically different approach".
Radicalness (n.) Quality or state of being radical.
Radicant (a.) (Bot.) Taking root on, or above, the ground; rooting from the stem, as the trumpet creeper and the ivy.
Radicate (a.) Radicated.
Radicate (v. i.) To take root; to become rooted. -- Evelyn.
Radicated (imp. & p. p.) of Radicate.
Radicating (p. pr. & vb. n.) of Radicate.
Radicate (v. t.) To cause to take root; to plant deeply and firmly; to root.
Time should . . . rather confirm and radicate in us the remembrance of God's goodness. -- Barrow.
Radicated (a.) Rooted; specifically:
Radicated (a.) (Bot.) Having roots, or possessing a well-developed root.
Radicated (a.) (Bot.) Having rootlike organs for attachment.
Radication (n.) The process of taking root, or state of being rooted; as, the radication of habits.
Radication (n.) (Bot.) The disposition of the roots of a plant.
Radicel (n.) (Bot.) A small branch of a root; a rootlet.
Radiciflorous (a.) Rhizanthous.
Radiciform (a.) Having the nature or appearance of a radix or root.
Radicle (n.) The rudimentary stem of a plant which supports the cotyledons in the seed, and from which the root is developed downward; the stem of the embryo; the caulicle.
Radicle (n.) A rootlet; a radicel.
Radicular (a.) Of or pertaining to roots, or the root of a plant.
Radicule (n.) A radicle.
Radiculose (a.) Producing numerous radicles, or rootlets.
Radii (n.) pl. of Radius.
Radio- () A combining form indicating connection with, or relation to, a radius or ray; specifically (Anat.), with the radius of the forearm; as, radio-ulnar, radio-muscular, radio-carpal.
Radioactive (a.) (Physics) 放射性的 Capable of luminescence under the action of cathode rays, X rays, or any of the allied forms of radiation. [Obs.]
Radioactive (a.) (Physics) Of, exhibiting, or caused by {radioactivity}.
Radioactive (a.) Exhibiting or caused by radioactivity; "radioactive isotope"; "radioactive decay"; "radioactive fallout" [ant: {nonradioactive}].
Radioactive (a.) 具有放射性的；有輻射性的 Having or producing the energy that comes from the breaking up of atoms.
// Uranium is a radioactive material.
// Radioactive waste.
Radioactivity (n.) [U] 放射（性） The quality that some atoms have of producing a type of energy that can be very harmful to health.
Radio-flagellata (n. pl.) A group of Protozoa having both flagella and pseudopodia.
Radiograph (n.) An instrument for measuring and recording solar radiation.
Radiograph (n.) An image or picture produced upon a sensitive surface, as of a photographic or fluorescent plate, by some form of penetrating radiation other than light, as X-rays, beta rays, etc.; esp., a picture of the internal structure of opaque objects traversed by the rays; a skiagraph. When the picture is produced upon photographic film by X-rays, the picture is usually called an X-ray photo or X-ray.
When an image is produced on photographic film by a radioactive substance in close proximity to the film, in a manner so as to record the spatial distribution of the radioactive substance, the resulting image is called an autoradiograph or autoradiograph or {autoradiogram. ra`di*og"ra*pher (n.)
Radiograph (n.) A photographic image produced on a radiosensitive surface by radiation other than visible light (especially by X-rays or gamma rays) [syn: radiogram, radiograph, shadowgraph, skiagraph, skiagram].
Radiograph (n.) X光照片 A picture produced by the Rontgen rays upon a sensitive surface, photographic or fluorescent, especially a picture of opaque objects traversed by the rays.
Compare: Rontgen
Rontgen (n.) (a.) = Roentgen.
Roentgen (n.) 【物】X射線；倫琴（X射線的照射劑量單位）A unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air [syn: roentgen, R].
Roentgen (n.) German physicist who discovered x-rays and developed roentgenography (1845-1923) [syn: Roentgen, Wilhelm Konrad Roentgen, Rontgen, Wilhelm Konrad Rontgen].
Roentgen (a.) （亦作R-）X射線的；有關X射線的Of or pertaining to the German physicist Wilhelm Konrad R["o]ntgen, or the rays discovered by him; as, R["o]ntgen apparatus.
Radiograph (n.) [C] (Medical) (Specialized) X-光（或其他射線）透射產生的圖像 An image produced by X-rays or other rays.
// A chest radiograph.
Radiograph (n.) A picture produced on a sensitive surface by a form of radiation other than visible light.
Specifically : An X-ray or gamma ray photograph.
Radiographic (a.), Radiographically (adv.)
Radiograph (v. t.) (radiographed; radiographing; radiographs) 給……拍X光照片 To make a radiograph of.
Radiolaria (n. pl.) Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina.
Radiolarian (a.) Of or pertaining to the Radiolaria.
Radiolarian (n.) One of the Radiolaria.
Radioli (n. pl.) The barbs of the radii of a feather; barbules.
Radiolite (n.) A hippurite.
Radiometer (n.) A forestaff.
Radiometer (n.) An instrument designed for measuring the mechanical effect of radiant energy.
Radiomicrometer (n.) A very sensitive modification or application of the thermopile, used for indicating minute changes of radiant heat, or temperature.
Radiophone (n.) An apparatus for the production of sound by the action of luminous or thermal rays. It is essentially the same as the photophone.
Radiophony (n.) The art or practice of using the radiophone.
Radious (a.) Consisting of rays, as light.
Radious (a.) Radiating; radiant.
Radish (n.) (Bot.) 蘿蔔；小蘿蔔 [C] The pungent fleshy root of a well-known cruciferous plant ({Raphanus sativus}); also, the whole plant.
{Radish fly} (Zool.), A small two-winged fly ({Anthomyia raphani}) whose larvae burrow in radishes. It resembles the onion fly.
{Rat-tailed radish} (Bot.), An herb ({Raphanus caudatus}) having a long, slender pod, which is sometimes eaten.
{Wild radish} (Bot.), The jointed charlock.
Radish (n.) Pungent fleshy edible root.
Radish (n.) Radish of Japan with a long hard durable root eaten raw or cooked [syn: {radish}, {daikon}, {Japanese radish}, {Raphanus sativus longipinnatus}].
Radish (n.) Pungent edible root of any of various cultivated radish plants.
Radish (n.) Eurasian plant widely cultivated for its edible pungent root usually eaten raw [syn: {radish}, {Raphanus sativus}].
Radish (n.) A cruciferous plant of the genus Raphanus having a pungent edible root [syn: {radish plant}, {radish}].
Radii (n. pl. ) of Radius.
Radiuses (n. pl. ) of Radius.
Radius (n.) (Geom.) A right line drawn or extending from the center of a circle to the periphery; the semidiameter of a circle or sphere.
Radius (n.) (Anat.) The preaxial bone of the forearm, or brachium, corresponding to the tibia of the hind limb. See Illust. of Artiodactyla.
Note: The radius is on the same side of the limb as the thumb, or pollex, and in man it is so articulated that its lower end is capable of partial rotation about the ulna.
Radius (n.) (Bot.) A ray, or outer floret, of the capitulum of such plants as the sunflower and the daisy. See Ray, 2.
Radius (n.) pl. (Zool.) The barbs of a perfect feather.
Radius (n.) Radiating organs, or color-markings, of the radiates.
Radius (n.) The movable limb of a sextant or other angular instrument. -- Knight.
Radius bar (Mach.), A bar pivoted at one end, about which it swings, and having its other end attached to a piece which it causes to move in a circular arc.
Radius of curvature. See under Curvature.
Radius (n.) The length of a line segment between the center and circumference of a circle or sphere [syn: radius, r].
Radius (n.) A straight line from the center to the perimeter of a circle (or from the center to the surface of a sphere).
Radius (n.) A circular region whose area is indicated by the length of its radius; "they located it within a radius of 2 miles".
Radius (n.) The outer and slightly shorter of the two bones of the human Forearm.
Radius (n.) Support consisting of a radial member of a wheel joining the hub to the rim [syn: spoke, wheel spoke, radius].
RADIUS, () Remote Authentication Dial-In User Service (RFC 2865).
RADIUS, () Remote Authentication Dial-In User Service
Radius vector () (Math.) A straight line (or the length of such line) connecting any point, as of a curve, with a fixed point, or pole, round which the straight line turns, and to which it serves to refer the successive points of a curve, in a system of polar coordinates. See Coordinate, n.
Radius vector (n.) (Astron.) An ideal straight line joining the center of an attracting body with that of a body describing an orbit around it, as a line joining the sun and a planet or comet, or a planet and its satellite.
Radius vector (n.) A line connecting a satellite to the center of the body around which it is rotating.
Radius vector (n.) A line connecting a point in space to the origin of a polar coordinate system.
Radices (n. pl. ) of Radix.
Radixes (n. pl. ) of Radix.
Radix (n.) (Philol.) A primitive word, from which spring other words; a radical; a root; an etymon.
Radix (n.) (Math.) A number or quantity which is arbitrarily made the fundamental number of any system; a base. Thus, 10 is the radix, or base, of the common system of logarithms, and also of the decimal system of numeration.
Radix (n.) (Math.) (Alg.) A finite expression, from which a series is derived.
Radix (n.) (Bot.) The root of a plant.
Radulae (n. pl. ) of Radula.