Having or showing two or more colors, or capable of changing colors based on environmental conditions like light or chemical pH.
From Greek 'amphi' (both) + 'chroma' (color) + '-ous' (adjective suffix). This is another variant form used to describe color-changing or multi-colored substances and organisms.
The chameleon's skin isn't actually amphichromous the way people think — they don't change color by changing pigment, but by expanding and contracting special color cells called chromatophores! It's microscopic engineering that took evolution millions of years to perfect.
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