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.

1860–65, Americanism; green + back1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
greenback (ˈɡriːnˌbæk)
1.  informal (US) an inconvertible legal-tender US currency note originally issued during the Civil War in 1862
2.  slang (US) a dollar bill

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"U.S. dollar bill," 1862, so called from the time of their introduction; bank paper money printed in green ink had been called this since 1778 (as opposed to redbacks, etc.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But deciding to move money beyond the greenback is easier than figuring out
  where to go.
Possession limits and length requirements apply, and greenback cutthroat trout
  are catch-and-release only.
The threatened greenback cutthroat trout once stared extinction in the face.
If their currencies rise too far against the greenback, their exporters will
  lose out wherever customers pay in dollars.
Related Words
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