/ Dictionary / Index P polysyllogism: Meaning and Definition of Find definitions for: pol•y•syl•lo•gism Pronunciation: (pol"ē-sil'u-jiz"um), [key] — n. Logic. an argument made up of a chain of syllogisms, the conclusion of each being a premise of the one following, until the last one. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. polysyllable polysynaptic 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