Definition of: polysynthetic

(pol′i·sin·thet′ik) adjective Ling.
Describing a language, such as Eskimo, or certain of the American Indian languages, in which the subject, object, verb, etc., of a sentence are combined into a single word and have no existence as separate elements. [<Gk. polysynthetos much compounded <poly- much + syntithenai <syn- together + tithenai put]