/ Dictionary / Index P petri dish: Meaning and Definition of Find definitions for: pe'tri dish" Pronunciation: (pē'trē), [key] a shallow, circular, glass or plastic dish with a loose-fitting cover over the top and sides, used for culturing bacteria and other microorganisms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. petri- Petrie Related Content Daily Word Quiz: augur Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language