/ Dictionary / Index P polysynthetic: Meaning and Definition of Find definitions for: pol•y•syn•thet•ic Pronunciation: (pol"ē-sin-thet'ik), [key] — adj. (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.(def. 3),(def. 3). of or pertaining to polysynthesism. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: polysynthetic (Thesaurus) polysynthesism polytechnic Related Content Daily Word Quiz: cygnet Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language