Pronunciation: (pol"ē-sin-thet'ik), [key]
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,pol"y•syn•thet'i•cal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.