Webster's Unabridged Dictionary - Letter F - Page 42
Fluo- () (Chem.) A combining form indicating fluorine as an ingredient; as in fluosilicate, fluobenzene.
Fluoborate (n.) (Chem.) A salt of fluoboric acid; a fluoboride.
Compare: Borofluoride
Borofluoride (n.)] (Chem.) A double fluoride of boron and hydrogen, or some other positive element, or radical; -- called also fluoboride, and formerly fluoborate.
Fluoboric (a.) (Chem.) Pertaining to, derived from, or consisting of, fluorine and boron.
Fluoridic acid (Chem.), A double fluoride, consisting essentially of a solution of boron fluoride, in hydrofluoric acid. It has strong acid properties, and is the type of the borofluorides. Called also borofluoric acid.
Fluoboride (n.) (Chem.) See Borofluoride. Fluocerine
Compare: Borofluoride
Borofluoride (n.) (Chem.) A double fluoride of boron and hydrogen, or some other positive element, or radical; -- called also fluoboride, and formerly fluoborate.
Fluocerine (n.) Alt. of Fluocerite.
Fluocerite
(n.)
(Min.) A
fluoride of cerium, occuring near Fahlun in Sweden. Tynosite, from
Fluohydric (a.) (Chem.) See Hydrofluoric.
Fluophosphate (n.) (Chem.) A double salt of fluoric and phosphoric acids.
Fluorite (n.) (Min.) Calcium fluoride ({CaF2), A mineral of many different colors, white, yellow, purple, green, red, etc., often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called fluor spar, or simply fluor.
Fluorite (n.) A soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine [syn: fluorite, fluorspar, fluor].
Fluor (n.) A fluid state. [Obs.] -- Sir I. Newton.
Fluor (n.) Menstrual flux; catamenia; menses. [Obs.]
Fluor (n.) (Min.) See Fluorite.
Fluor (n.) A soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine [syn: fluorite, fluorspar, fluor].
Fluor albus () (Med.) The whites; leucorrhaea.
Fluoranthene (n.) (Chem.) A white crystalline hydrocarbon C15H10, of a complex structure, found as one ingredient of the higher boiling portion of coal tar.
Fluorated (a.) (Chem.) Combined with fluorine; subjected to the action of fluoride. [R.]
Fluorene (n.) (Chem.) A colorless, crystalline hydrocarbon, C13H10 having a beautiful violet fluorescence; whence its name. It occurs in the higher boiling products of coal tar, and is obtained artificially.
Fluorescein (n.) (Chem.) A yellowish red, crystalline substance, C20H12O5, produced by heating together phthalic anhydride and resorcin; -- so called, from the very brilliant yellowish green fluorescence of its alkaline solutions. It has acid properties, and its salts of the alkalies are known to the trade under the name of uranin.
Syn: fluorescein, fluorescent dye, resorcinolphthalein.
Fluorescein (n.) A yellow dye that is visible even when highly diluted; used as an absorption indicator when silver nitrate solution is added to sodium chloride in order to precipitate silver chloride (turns pink when no chloride ions are left in solution and negative fluorescein ions are then absorbed) [syn: fluorescein, fluoresceine, fluorescent dye, resorcinolphthalein].
Fluorescence (n.) (Chemistry, Optics) A luminescence emitted by certain substances due to the absorption of radiation at one wavelength, and the almost instantaneous re-emission of radiation at another, usually longer wavelength. The re-radiation stops almost as soon as the incident radiation is halted, thus distinguishing this phenomenon from phosphorescence, in which re-radiation of light may continue for some time after the incident radiation is halted.
Note: The color of the radiated light typically differs from the apparent color of the material, as when green crystals of fluor spar afford blue reflections. It is due not to the difference in the color of a distinct surface layer, but to the power which the substance has of modifying the light incident upon it, by first absorbing the light to achieve an excited state, and then radiating light to resume the ground energy level.
The light emitted by fluorescent substances is in general of longer wavelength than the incident light.
The radiation can also be induced by ionizing radiation which is not electromagnetic, such as alpha or beta rays, and cathode rays. This property is possessed by fluorspar, uranium glass, sulphide of calcium, and many other substances. It finds use in analytical instruments to detect or measure radiation, and in some commercial applications.
Fluorescence (n.) Light emitted during absorption of radiation of some other (invisible) wavelength.
Fluorescent (a.) Having the property of fluorescence.
Fluorescent (a.) Emitting light during exposure to radiation from an external source.
Fluorescent (a.) Brilliantly colored and apparently giving off light; "fluorescent colors."
Fluorescent (n.) A lighting fixture that uses a fluorescent lamp [syn: fluorescent, fluorescent fixture].
Fluorescin (n.) (Chem.) A colorless, amorphous substance which is produced by the reduction of fluorescein, and from which the latter may be formed by oxidation.
Fluoric (a.) (Chem.) Pertaining to, obtained from, or containing, fluorine.
Fluoride (n.) (Chem.) A binary compound of fluorine with another element or radical.
Calcium fluoride (Min.), Fluorite, CaF2. See Fluorite.
Fluoride (n.) A salt of hydrofluoric acid.
Fluorine (n.) (Chem.) A non-metallic, gaseous element, strongly acid or negative, or associated with chlorine, bromine, and iodine, in the halogen group of which it is the first member. It always occurs combined, is very active chemically, and possesses such an avidity for most elements, and silicon especially, that it can neither be prepared nor kept in glass vessels. If set free it immediately attacks the containing material, so that it was not isolated until 1886. It is a pungent, corrosive, colorless gas. Symbol F. Atomic weight 19.00.
Note: Fluorine unites with hydrogen to form hydrofluoric acid, which is the agent employed in etching glass. It occurs naturally, principally combined as calcium fluoride in fluorite, and as a double fluoride of aluminium and sodium in cryolite.
Fluorine (n.) A nonmetallic univalent element belonging to the halogens; usually a yellow irritating toxic flammable gas; a powerful oxidizing agent; recovered from fluorite or cryolite or fluorapatite [syn: fluorine, F, atomic number 9].
Fluorine
Symbol: F
Atomic number: 9
Atomic weight: 18.9984
A poisonous pale yellow gaseous element belonging to group 17 of the periodic table (The halogens). It is the most chemically reactive and electronegative element. It is highly dangerous, causing severe chemical burns on contact with flesh. Fluorine was identified by Scheele in 1771 and first isolated by Moissan in 1886.
Fluorite (n.) Calcium fluoride, a mineral of many different colors, white, yellow, purple, green, red, etc., often very beautiful, crystallizing commonly in cubes with perfect octahedral cleavage; also massive. It is used as a flux. Some varieties are used for ornamental vessels. Also called fluor spar, or simply fluor.
Fluoroid (n.) A tetrahexahedron; -- so called because it is a common form of fluorite.
Fluoroscope (n.) An instrument for observing or exhibiting fluorescence.
Fluorous (a.) Pertaining to fluor.
Fluor spar () See Fluorite.
Fluosilicate (n.) A double fluoride of silicon and some other (usually basic) element or radical, regarded as a salt of fluosilicic acid; -- called also silicofluoride.
Fluosilicic (a.) Composed of, or derived from, silicon and fluorine.
Flurried (a.) Agitated; excited.
Flurries (n. pl. ) of Flurry.
Flurry (n.) A sudden and brief blast or gust; a light, temporary breeze; as, a flurry of wind.
Flurry (n.) A light shower or snowfall accompanied with wind.
Flurry (n.) Violent agitation; commotion; bustle; hurry.
Flurry (n.) The violent spasms of a dying whale.
Flurried (imp. & p. p.) of Flurry.
Flurrying (p. pr. & vb. n.) of Flurry.
Flurry (v. t.) To put in a state of agitation; to excite or alarm.
Flurt (n.) A flirt.
Flushed (imp. & p. p.) of Flush.
Flushing (p. pr. & vb. n.) of Flush.
Flush (v. i.) To flow and spread suddenly; to rush; as, blood flushes into the face.
Flush (v. i.) To become suddenly suffused, as the cheeks; to turn red; to blush.
Flush (v. i.) To snow red; to shine suddenly; to glow.
Flush (v. i.) To start up suddenly; to take wing as a bird.
Flush (v. t.) To cause to be full; to flood; to overflow; to overwhelm with water; as, to flush the meadows; to flood for the purpose of cleaning; as, to flush a sewer.
Flush (v. t.) To cause the blood to rush into (the face); to put to the blush, or to cause to glow with excitement.
Flush (v. t.) To make suddenly or temporarily red or rosy, as if suffused with blood.
Flush (v. t.) To excite; to animate; to stir.
Flush (v. t.) To cause to start, as a hunter a bird.
Flush (n.) A sudden flowing; a rush which fills or overflows, as of water for cleansing purposes.
Flush (n.) A suffusion of the face with blood, as from fear, shame, modesty, or intensity of feeling of any kind; a blush; a glow.
Flush (n.) Any tinge of red color like that produced on the cheeks by a sudden rush of blood; as, the flush on the side of a peach; the flush on the clouds at sunset.
Flush (n.) A sudden flood or rush of feeling; a thrill of excitement. animation, etc.; as, a flush of joy.
Flush (n.) A flock of birds suddenly started up or flushed.
Flush (n.) A hand of cards of the same suit.
Flush (a.) Full of vigor; fresh; glowing; bright.
Flush (a.) Affluent; abounding; well furnished or suppled; hence, liberal; prodigal.
Flush (a.) Unbroken or even in surface; on a level with the adjacent surface; forming a continuous surface; as, a flush panel; a flush joint.
Flush (a.) Consisting of cards of one suit.
Flush (adv.) So as to be level or even.
Flushboard (n.) Same as Flashboard.
Flusher (n.) A workman employed in cleaning sewers by flushing them with water.
Flusher (n.) The red-backed shrike. See Flasher.
Flushing (n.) A heavy, coarse cloth manufactured from shoddy; -- commonly in the /
Flushing (n.) A surface formed of floating threads.
Flushingly (adv.) In a flushing manner.
Flushness (n.) The state of being flush; abundance.
Flustered (imp. & p. p.) of Fluster.
Flustering (p. pr. & vb. n.) of Fluster.
Fluster (v. t.) To make hot and rosy, as with drinking; to heat; hence, to throw into agitation and confusion; to confuse; to muddle.
Fluster (v. i.) To be in a heat or bustle; to be agitated and confused.
Fluster (n.) Heat or glow, as from drinking; agitation mingled with confusion; disorder.
Flusteration (n.) The act of flustering, or the state of being flustered; fluster.
Flustrate (v. t.) To fluster.
Flustration (n.) The act of flustrating; confusion; flurry.
Flute (v. i.) A musical wind instrument, consisting of a hollow cylinder or pipe, with holes along its length, stopped by the fingers or by keys which are opened by the fingers. The modern flute is closed at the upper end, and blown with the mouth at a lateral hole.
Flute (v. i.) A channel of curved section; -- usually applied to one of a vertical series of such channels used to decorate columns and pilasters in classical architecture. See Illust. under Base, n.
Flute (n.) A similar channel or groove made in wood or other material, esp. in plaited cloth, as in a lady's ruffle.
Flute (n.) A long French breakfast roll.
Flute (n.) A stop in an organ, having a flutelike sound.
Flute (n.) A kind of flyboat; a storeship.
Flute (v. i.) To play on, or as on, a flute; to make a flutelike sound.
Fluted (imp. & p. p.) of Flute.
Fluting (p. pr. & vb. n.) of Flute.
Flute (v. t.) To play, whistle, or sing with a clear, soft note, like that of a flute.
Flute (v. t.) To form flutes or channels in, as in a column, a ruffle, etc.
Flute a bec () A beak flute, an older form of the flute, played with a mouthpiece resembling a beak, and held like a flageolet.
Fluted (a.) Thin; fine; clear and mellow; flutelike; as, fluted notes.
Fluted (a.) Decorated with flutes; channeled; grooved; as, a fluted column; a fluted ruffle; a fluted spectrum.
Flutemouth (n.) A fish of the genus Aulostoma, having a much elongated tubular snout.
Fluter (n.) One who plays on the flute; a flutist or flautist.
Fluter (n.) One who makes grooves or flutings.
Fluting (n.) Decoration by means of flutes or channels; a flute, or flutes collectively; as, the fluting of a column or pilaster; the fluting of a lady's ruffle.
Flutist (n.) A performer on the flute; a flautist.
Flutist (n.) To move with quick vibrations or undulations; as, a sail flutters in the wind; a fluttering fan.
Flutist (n.) To move about briskly, irregularly, or with great bustle and show, without much result.
Flutist (n.) To be in agitation; to move irregularly; to flucttuate; to be uncertainty.
Flutter (v. t.) To vibrate or move quickly; as, a bird flutters its wings.
Flutter (v. t.) To drive in disorder; to throw into confusion.