The Collaborative International Dictionary of English v.0.48:
Xanthosis \Xan*tho"sis\, n. [NL., fr. Gr. xanqo`s yellow.] (Med.) The yellow discoloration often observed in cancerous tumors. [1913 Webster]WordNet (r) 3.0 (2006):
xanthosis n 1: an abnormal yellow discoloration of the skin