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From 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]