/ kəˈmiːliən; NAmE / noun
1.
a small lizard (= a type of reptile ) that can change colour according to its surroundings
2.
(often disapproving ) a person who changes their behaviour or opinions according to the situation
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WORD ORIGIN
Middle English : via Latin chamaeleon from Greek khamaileōn , from khamai on the ground + leōn lion.