- serving as a sign or warning of danger, as the conspicuous colors or markings of certain poisonous animals.
- (of the conspicuous coloration of certain animals) acting as a warning, esp to potential predators
adj.“significant, indicative,” 1890, from Greek semat-, comb. form of sema (genitive sematos) “sign” (see semantic) + -ic. Used especially in biology, in reference to “warning” colors, etc.