noun.
A word of more than two and usually more than three syllables.
The Century Dictionary and Cyclopedia
noun.
A word of several syllables; usually, a word of four or more syllables, words of one syllable being called monosyllables, those of two dissyllables, and those of three trisyllables.
the GNU version of the Collaborative International Dictionary of English
noun.
A word of many syllables, or consisting of more syllables than three; -- words of less than four syllables being called monosyllables, dissyllables, and trisyllables.
noun.
A word with more than two syllables. Sometimes used in a more restricted sense.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
noun.
a word of more than three syllables
Word Usage
"He spoke in sentences that clocked in at a grade-school level, the speed of delivery was lugubrious, or perhaps aimed at the part of the audience that processes the occasional polysyllable rather slowly."