greenback

Plural: greenbacks

Noun

• a piece of paper money (especially one issued by a central bank)
• Any bill that is legal tender in the US (originally printed with green and black ink) issued by the Federal Reserve.
• The United States dollar.
• A unit of American currency issued during the Civil War by the Treasury Department.
• A wave that has not yet begun to break.

Synonyms

bank bill, bank note, banker's bill, banknote, bill, Federal Reserve note, government note, note