Usually, leftovers. food remaining uneaten at the end of a meal, especially when saved for later use.
anything left or remaining from a larger amount; remainder.
being left or remaining, as an unused portion or amount: leftover meatloaf.

1890–95; noun use of verb phrase left over; see left2

3. surplus, excess, extra.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
leftover (ˈlɛftˌəʊvə)
1.  (often plural) an unused portion or remnant, as of material or of cooked food
2.  left as an unused portion or remnant

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

"something left over," 1891, from left + over. As an adj., "remaining, not used up," from 1897.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They took something called rice husk ash: the leftover husks from processing
  rice are burned for energy, and the ash remains.
The remaining liquid, which contains the leftover salts, shoots out of the
  system at high pressure.
The leftover mashed-up pulp is then treated with a solvent to remove any
  remaining oil.
They then headed for a lone, leftover, bouncy string.
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