sematic

[si-mat-ik] /sɪˈmæt ɪk/
adjective, Biology
1.
serving as a sign or warning of danger, as the conspicuous colors or markings of certain poisonous animals.
Origin
1885-90; < Greek sēmat- (stem of sêma) sign + -ic
British Dictionary definitions for sematic

sematic

/sɪˈmætɪk/
adjective
1.
(of the conspicuous coloration of certain animals) acting as a warning, esp to potential predators
Word Origin
C19: from Greek sēma a sign
Word Origin and History for sematic
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.