'Metachrosis' definitions:

Definition of 'Metachrosis'

From: GCIDE

Metachrosis \Met`a*chro"sis\, n. [NL., from Gr. ? beyond + ? a coloring.] (Biol.) The power of changing color at will by the expansion of special pigment cells, under nerve influence, as seen in many reptiles, fishes, etc. --Cope. [1913 Webster]