metachrosis
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met·a·chro·sis
(met'ă-krō'sis),A change of color such as occurs in certain animals, for example, the chameleon, by expansion and contraction of chromatophores.
[meta- + G. chrōsis, a coloring]
metachrosis
(mĕt-ă-krō′sĭs)The ability to change color in some animals, as in the chameleon.