semiochemˈical noun

A chemical produced by an animal, eg in a scent gland, and used as a means of signalling its presence, readiness to mate, etc

semiologˈical adjective

semiolˈogist noun

semiolˈogy noun

1. The science or study of signs or signals, esp of spoken or written words as signs and their relationships with the objects, concepts, etc they refer to (linguistics)
2. The scientific study of signs and symptoms (pathology). See also semiotics