/ Dictionary / Index F fossil gum: Meaning and Definition of Find definitions for: fos'sil gum" Pronunciation: [key] any gum, found chiefly in the earth, that was yielded by a now fossilized tree. Cf. amber. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fossil fuel fossiliferous Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language