Metachrosis

1 definition found

From The Collaborative International Dictionary of English v.0.48 [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]