Chameleon /(kȧ*mē"lē̇*ŭn)/

Cha·me·le·on

Chameleon

n.
  1. A lizardlike reptile of the genus Chamæleo, of several species, found in Africa, Asia, and Europe. The skin is covered with fine granulations; it has eyes which can move separately, the tail is prehensile, and the body is much compressed laterally, giving it a high back. It is remarkable for its ability to change the color of its skin to blend with its surroundings. (Zool.)
  2. a person who changes opinions, ideas, or behavior to suit the prevailing social climate; an opportunist.

Phrases & Compounds
Chameleon mineral
the compound called potassium permanganate, a dark violet, crystalline substance, KMnO4, which in formation passes through a peculiar succession of color from green to blue, purple, red, etc. See Potassium permanganate, under Potassium.