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[floo-awr, -er] /ˈflu ɔr, -ər/

noun, Mineralogy.
variant of before a vowel:
fluorene; fluoric.
another name for fluorspar
combining form
a variant of fluoro- fluorene, fluorine

16c., and old chemistry term for “minerals which were readily fusible and useful as fluxes in smelting” [Flood], Latin fluor, originally meaning “a flowing, flow” (see fluent). Since 1771 applied to minerals containing fluorine, especially calcium fluoride (fluorspar or fluorite).

fluor- pref.
Variant of fluoro-.


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  • Fluorapatite

    [floo r-ap-uh-tahyt, flawr-, flohr-] /flʊərˈæp əˌtaɪt, flɔr-, floʊr-/ noun 1. a crystalline mineral, Ca 5 (PO 4) 3 F, formed from hydroxyapatite in the presence of fluoride, that has a hardening effect on bones and teeth. /ˌflʊəˈræpətaɪt/ noun 1. a mineral consisting of calcium fluorophosphate; the most common form of apatite

  • Fluoresce

    [floo-res, flaw-, floh-] /flʊˈrɛs, flɔ-, floʊ-/ verb (used without object), fluoresced, fluorescing. 1. to exhibit . /ˌflʊəˈrɛs/ verb 1. (intransitive) to exhibit fluorescence

  • Fluorene

    [floo r-een, -in, flawr-, flohr-] /ˈflʊər in, -ɪn, ˈflɔr-, ˈfloʊr-/ noun, Chemistry. 1. a white, crystalline, water-insoluble solid, C 13 H 10 , used chiefly in the manufacture of resins and dyes. /ˈflʊəriːn/ noun 1. a white insoluble crystalline solid used in making dyes. Formula: (C6H4)2CH2

  • Fluorescence

    [floo-res-uh ns, flaw-, floh-] /flʊˈrɛs əns, flɔ-, floʊ-/ noun, Physics, Chemistry. 1. the emission of radiation, especially of visible light, by a substance during exposure to external radiation, as light or x-rays. Compare (def 1). 2. the property possessed by a substance capable of such emission. 3. the radiation so produced. /ˌflʊəˈrɛsəns/ noun 1. (physics) […]

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