/ Dictionary / Index P pilaster mass: Meaning and Definition of Find definitions for: pilas'ter mass" Pronunciation: [key] — Archit. Archit. an engaged pier, usually plain, used as a buttress. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pilastered pilaster strip 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