from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A mineral, essentially CaF2, that is often fluorescent in ultraviolet light and occurs in light green, blue, yellow, brown, and colorless forms. Also called fluor, fluorspar.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A widely occurring mineral (calcium fluoride), of various colours, used as a flux in steelmaking, and in the manufacture of glass, enamels and hydrofluoric acid.
from the GNU version of the Collaborative International Dictionary of English
- n. 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.
from The Century Dictionary and Cyclopedia
- n. Same as fluor-spar.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a soft mineral (calcium fluoride) that is fluorescent in ultraviolet light; chief source of fluorine
Sorry, no etymologies found.