greenback

/ˈɡrinˌbæk/
noun
  1. A U.S. dollar bill, especially one printed in green ink on the back.
    • He pulled a crumpled greenback from his pocket to pay for the coffee.
    • Tourists often call American money 'greenbacks' because of its color.
    • The old greenback had a portrait of George Washington on the front.
  2. Paper money issued by the U.S. government during the Civil War, not backed by gold or silver.
    • The government printed greenbacks to help finance the war effort.
    • Collectors value Civil War-era greenbacks for their historical significance.
    • Unlike gold coins, greenbacks were not redeemable for precious metal.
Synonyms
What does "greenback" mean? | whatsthatwordmean | whatsthatwordmean