Etymology
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greenback (n.)

"U.S. dollar bill," 1862, so called from the time of their introduction, from green (adj.) + back (n.); bank paper money printed in green ink had been called this since 1778 (as opposed to redbacks, etc.).

updated on November 17, 2012

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Definitions of greenback from WordNet

greenback (n.)
a piece of paper money (especially one issued by a central bank);
Synonyms: bill / note / government note / bank bill / banker's bill / bank note / banknote / Federal Reserve note
From wordnet.princeton.edu, not affiliated with etymonline.