/ Dictionary / Index F fluo-: Meaning and Definition of Find definitions for: fluo- Pronunciation: [key] var. offluoboric. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. flunky fluoborate Related Content Daily Word Quiz: penury Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language