fluor

UK: /ˈfluːɔː/ US: (flo̅o̅′ôr, -ər)

WordReference Random House Unabridged Dictionary of American English © 2025

flu•or  (flo̅o̅′ôr, -ər), n. [Mineral.]

1. Mineralogy fluorite.

• Latin fluor a flowing; so called from its use as a flux
• 1615–25

fluor-, 

1. Chemistry var. of fluoro- before a vowel:
   fluorene; fluoric.

Collins Concise English Dictionary © HarperCollins Publishers::

fluor / ˈfluːɔː/ noun

1. another name for fluorspar

Etymology: 17th Century: from Latin: a flowing; so called from its use as a metallurgical flux

WordReference Random House Unabridged Dictionary of American English © 2025

fluoro-, 

1. Chemistry a combining form with the meanings "fluorine,'' "fluoride,'' used in the formation of compound words:
   fluorocarbon.
2. Chemistry, Physics a combining form with the meaning "fluorescence,'' used in the formation of compound words:
   fluoroscopy.
Also, fluo-;
 [esp. before a vowel,] fluor-. 
• Neo-Latin; see fluor, -o-

WordReference Random House Unabridged Dictionary of American English © 2025

flu•or•spar  (flo̅o̅′ôr spär′, -ər-), n. [Mineral.]

1. Mineralogy fluorite.

Also, flu′or spar′. 

• fluor- + spar³ 1785–95

Collins Concise English Dictionary © HarperCollins Publishers::

fluor- combining_form

1. a variant of fluoro-: fluorene, fluorine

Collins Concise English Dictionary © HarperCollins Publishers::

fluorspar / ˈflʊəˌspɑː/, fluor noun

1. a white or colourless mineral sometimes fluorescent and often tinted by impurities, found in veins and as deposits from hot gases. It is used in the manufacture of glass, enamel, and jewellery, and is the chief ore of fluorine. Composition: calcium fluoride. Formula: CaF₂. Crystal structure: cubic
   Also: (US and Canadian) fluorite