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Define the word Xanthoprotein

"Xanthoprotein" gcide "The Collaborative International Dictionary of English v.0.48"

Xanthoprotein \Xan`tho*pro"te*in\, n. [Xantho- + protein.]
   (Physiol. Chem.)
   A yellow acid substance formed by the action of hot nitric
   acid on albuminous or proteid matter. It is changed to a deep
   orange-yellow color by the addition of ammonia.
   [1913 Webster]