/ Dictionary / Index Y yellow gum: Meaning and Definition of Find definitions for: yel'low gum' Pronunciation: [key] any of several Australian eucalyptuses, as Eucalyptus melliodora, having yellowish bark. any of several tupelos. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. yellow-green algae yellowhammer Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language