/ Dictionary / Index F Freon: Meaning and Definition of Find definitions for: Fre•on Pronunciation: (frē'on), [key] — Trademark. Trademark. a brand name for any of a class of liquid or gaseous fluorocarbon or chlorofluorocarbon products, used chiefly as refrigerants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: freon (Thesaurus) frenzy freq. Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language