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.
Fluorite
(Flu"or*ite) n. (Min.) 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
(Flu"or*oid) n. [Fluor + - oid.] (Crystallog.) A tetrahexahedron; so called because it is a
common form of fluorite.
Fluoroscope
(Flu*or"o*scope) n. [Fluorescence + -scope.] (Phys.) An instrument for observing or
exhibiting fluorescence.
Fluorous
(Flu"or*ous) a. Pertaining to fluor.
Fluor spar
(Flu"or spar`) (Min.) See Fluorite.
Fluosilicate
(Flu`o*sil"i*cate) n. [Cf. F. fluosilicate.] (Chem.) A double fluoride of silicon and some
other (usually basic) element or radical, regarded as a salt of fluosilicic acid; called also silicofluoride.
Fluosilicic
(Flu`o*si*lic"ic) a. [Fluo- + silicic: cf. F. fluosilicique.] (Chem.) Composed of, or derived
from, silicon and fluorine.
Fluosilicic acid, a double fluoride of hydrogen and silicon, H2F6Si, obtained in solution in water as
a sour fuming liquid, and regarded as the type of the fluosilicates; called also silicofluoric acid, and
hydrofluosilicic acid.
Flurried
(Flur"ried) a. Agitated; excited. Flur"ried*ly adv.
Flurry
(Flur"ry) n.; pl. Flurries [Prov. E. flur to ruffle.]
1. A sudden and brief blast or gust; a light, temporary breeze; as, a flurry of wind.
2. A light shower or snowfall accompanied with wind.
Like a flurry of snow on the whistling wind.
Longfellow. 3. Violent agitation; commotion; bustle; hurry.
The racket and flurry of London.
Blakw. Mag. 4. The violent spasms of a dying whale.
Flurry
(Flur"ry), v. t. [imp. & p. p. Flurried ; p. pr. & vb. n. Flurrying.] To put in a state of agitation; to
excite or alarm. H. Swinburne.
Flurt
(Flurt) n. A flirt. [Obs.] Quarles.
Flush
(Flush) v. i. [imp. & p. p. Flushed ; p. pr. & vb. n. Flushing.] [Cf. OE. fluschen to fly up,
penetrate, F. fluz a flowing, E. flux, dial. Sw. flossa to blaze, and E. flash; perh. influenced by blush.
&radic84.]