/ Dictionary / Index G greenfly: Meaning and Definition of Find definitions for: green•fly Pronunciation: (grēn'flī"), [key] — pl. -flies. an aphid, Coloradoa rufomaculata, that is an important pest of chrysanthemums. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: greenfly (Thesaurus) green flash greengage Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language