Dictionary.com
Thesaurus.com

xanthochroism

British  
/ zænˈθɒkrəʊˌɪzəm /

noun

  1. a condition in certain animals, esp aquarium goldfish, in which all skin pigments other than yellow and orange disappear

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of xanthochroism

C19: from Greek xanthokhro ( os ) yellow-skinned (from xanthos yellow + khroia skin) + -ism