- semaphoreAny equipment used for visual signalling by means of flags, lights, or mechanically moving arms, which are used to represent letters of the alphabet, or words.
- semeAnything which serves for any purpose as a substitute for an object of which it is, in some sense, a representation, sign, or symbol.
- aposematismAn adaptation, especially a form of coloration, that warns off potential predators.
- megasemeHaving the orbital index relatively large, therefore having eye sockets nearby.
- mesosemeHaving a medium orbital index, between megaseme and microseme.
- microsemeHaving the orbital index relatively narrow, therefore having eye sockets far away.
- sema-Communicating meaning.
- semostomousHaving long oral processes.