1. a combining form with the meanings “fluorine,” “fluoride,” used in the formation of compound words: fluorocarbon.
  2. 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. 2018

British Dictionary definitions for fluoro-


before a vowel fluor-

combining form
  1. indicating the presence of fluorinefluorocarbon
  2. 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

fluoro- in Medicine


  1. Fluorine:fluorosis.
  2. Fluorescence:fluoroscope.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.