What is "sematic"

Sematic \Se*mat"ic\ (s[-e]*m[a^]t"[i^]k), a. [Gr. sh^ma, sh`matos, sign, token.] Significant; ominous; serving as a warning of danger; -- applied esp. to the warning colors or forms of certain animals.

"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.

a. (context biology of the colouring of some insects etc English) Acting as a sign of danger.