Part 227

J. Morley.

Flung (?), imp. & p. p. of Fling.

Flunk (flk), v. i. [imp. & p. p. Flunked (flkt); p. pr. & vb. n. Flunking.] [Cf. Funk.] To fail, as on a lesson; to back out, as from an undertaking, through fear.

Flunk, v. t. To fail in; to shirk, as a task or duty. [Colloq. U.S.]

Flunk, n. A failure or backing out; specifically (College cant), a total failure in a recitation. [U.S.]

Flun"ky (fl"k), n.; pl. Flunkies (- kz). [Prob. fr. or akin to flank.] [Written also flunkey.] 1. A contemptuous name for a liveried servant or a footman.

2. One who is obsequious or cringing; a snob.

3. One easily deceived in buying stocks; an inexperienced and unwary jobber. [Cant, U.S.]

Flun"ky*dom (?), n. The place or region of flunkies. C. Kingsley.

Flun"ly*ism (?), n. The quality or characteristics of a flunky; readiness to cringe to those who are superior in wealth or position; toadyism. Thackeray.

Flu"o- (&?;). (Chem.) A combining form indicating fluorine as an ingredient; as in fluosilicate, fluobenzene.

Flu`o*bo"rate (?), n. [Cf. F. fluoborate.] (Chem.) A salt of fluoboric acid; a fluoboride.

Flu`o*bo"ric (?), a. [Fluo- boric: cf. F. fluoborique.] (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.

Flu`o*bo"ride (?), n. (Chem.) See Borofluoride.

{ Flu`o*ce"rine (?), Flu`o*ce"rite (?) }, n. [Fluo- + cerium.] (Min.) A fluoride of cerium, occuring near Fahlun in Sweden. Tynosite, from Colorado, is probably the same mineral.

Flu`o*hy"dric (?), a. [Fluo- + hydrogen.] (Chem.) See Hydrofluoric.

Flu`o*phos"phate (?), n. [Fluo- + phosphate.] (Chem.) A double salt of fluoric and phosphoric acids.

||Flu"or (?), n. [L., a flowing, fr. fluere to flow. See Fluent.] 1. A ||fluid state. [Obs.] Sir I. Newton.

2. Menstrual flux; catamenia; menses. [Obs.]

3. (Min.) See Fluorite.

||Flu"or albus (?). [L., white flow.] (Med.) The whites; leucorrhÊa.

Flu`or*an"thene (?), n. [Fluorene + anthracene.] (Chem.) A white crystalline hydrocarbon C15H10, of a complex structure, found as one ingredient of the higher boiling portion of coal tar.

Flu"or*a`ted (?), a. (Chem.) Combined with fluorine; subjected to the action of fluoride. [R.]

Flu`or*ene (?), 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.

Flu`o*res"ce*in (?), 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.

Flu`o*res"cence (?), n. [From Fluor.] (Opt.) That property which some transparent bodies have of producing at their surface, or within their substance, light different in color from the mass 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. The light emitted by fluorescent substances is in general of lower refrangibility than the incident light. Stockes.

Flu`o*res"cent (?), a. Having the property of fluorescence.