/pol'ee sin thet"ik/ , adj.
1. (of a language) characterized by a prevalence of relatively long words containing a large number of affixes to express syntactic relationships and meanings. Many American Indian languages are polysynthetic. Cf. analytic (def. 3), synthetic (def. 3).
2. of or pertaining to polysynthesism.
Also, polysynthetical .
[ 1795-1805; polysýnthet ( os ) much compounded + -IC. See POLY-, SYNTHETIC ]