xanthelasma definitions WordNet (r) 3.0 (2005) n 1: xanthoma of ... eyelids; occurs chiefly in the elderly Webster's 1913 Dictionary Xanthelasma Xan`the*las"ma, n. [NL.; Gr. xanqo`s yellow ... patches upon the skin, especially upon the eyelids; -- called also xanthelasma.