/ Dictionary / Index P pentasyllable: Meaning and Definition of Find definitions for: pen•ta•syl•la•ble Pronunciation: (pen'tu-sil"u-bul), [key] — n. a word or line of verse of five syllables. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pentastylos Pentateuch Related Content Daily Word Quiz: fresco Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language