theriomorphosis (????r???m???f??s?s) n1. (Alternative Belief Systems) transformation into an animal form, often associated with mythological characters2. (Psychology) a belief in the human ability to transform into an animal form, associated with mental disordersCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014