/ Dictionary / Index P portrait flask: Meaning and Definition of Find definitions for: por'trait flask" Pronunciation: [key] a glass flask of the 19th century having a portrait molded onto the side. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. portrait portraitist Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language