/ Dictionary / Index P pier glass: Meaning and Definition of Find definitions for: pier' glass" Pronunciation: [key] a tall mirror, often full-length, intended to be set between windows. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Piercy pierhead Related Content Daily Word Quiz: languid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language