/ Dictionary / Index P particle board: Meaning and Definition of Find definitions for: par'ticle board" Pronunciation: [key] any of various composition boards formed from small particles of wood, as flakes or shavings, tightly compressed and bonded together with a resin. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. particle beam particle physics Related Content Daily Word Quiz: fervor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language