scavenge

[skav-inj]
verb (used with object), scavenged, scavenging.
1.
to take or gather (something usable) from discarded material.
2.
to cleanse of filth, as a street.
3.
to expel burnt gases from (the cylinder of an internal-combustion engine).
4.
Metallurgy. to purify (molten metal) by introducing a substance that will combine chemically with impurities.
verb (used without object), scavenged, scavenging.
5.
to act as a scavenger.
6.
(of an engine or cylinder) to become scavenged of burnt gases.
7.
to search, especially for food.

Origin:
1635–45; back formation from scavenger

unscavenged, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
scavenge (ˈskævɪndʒ)
 
vb
1.  to search for (anything usable) among discarded material
2.  (tr) to purify (a molten metal) by bubbling a suitable gas through it. The gas may be inert or may react with the impurities
3.  to clean up filth from (streets, etc)
4.  chem to act as a scavenger for (atoms, molecules, ions, radicals, etc)

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
If only scavenging, it makes sense herbivores can supplement their protein this
  way.
We did witness a little horseplay between a few of them as they were scavenging
  for grain.
The fund could well become a target for politicians used to scavenging for the
  wherewithal to buy votes.
And a lot of people simply feel more connected by scavenging for conversational
  scraps from their friends.
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