/ Dictionary / Index P penstemon: Meaning and Definition of Find definitions for: pen•ste•mon Pronunciation: (pen-stē'mun, pen'stu-mun), [key] — n. any of numerous chiefly North American plants belonging to the genus Penstemon, of the figwort family, some species of which are cultivated for their showy, variously colored flowers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: penstemon (Thesaurus) pensive penstock Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language