[floo-awr, -er]

noun Mineralogy.

Origin of fluor

First recorded in 1615–25, fluor is from the Latin word fluor a flowing; so called from its use as a flux


a combining form with the meanings “fluorine,” “fluoride,” used in the formation of compound words: fluorocarbon.
a combining form with the meaning “fluorescence,” used in the formation of compound words: fluoroscopy.
Also fluo-; especially before a vowel, fluor-

Origin of fluoro-

From New Latin; see origin at fluor, -o-
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for fluor

Historical Examples of fluor

British Dictionary definitions for fluor



another name for fluorspar

Word Origin for fluor

C17: from Latin: a flowing; so called from its use as a metallurgical flux


before a vowel fluor-

combining form

indicating the presence of fluorinefluorocarbon
indicating fluorescencefluoroscope
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for fluor

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).

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for fluor



The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.