chromatophore
A pigment-containing cell found in many animals, responsible for color change and patterning. Used in biology and zoology contexts.
The chromatophores of squid are directly controlled by nerves.
Body color changes through the contraction and expansion of chromatophores.
Compound of 色素 (shikiso, 'pigment') and 胞 (hō, 'sac' or 'cell'), a straightforward modern scientific term.