/ Dictionary / Index G greenback: Meaning and Definition of Find definitions for: green•back Pronunciation: (grēn'bak"), [key] — n. a U.S. legal-tender note, printed in green on the back since the Civil War, originally issued against the credit of the country and not against gold or silver on deposit. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: greenback (Thesaurus) Greenaway green-backed heron Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language