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Meaning of greenback

green•back

Pronunciation: (grēn'bak"), [key]
— n.
  1. 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:
Greenaway green-backed heron