/ Dictionary / Index P pian: Meaning and Definition of Find definitions for: pi•an Pronunciation: (pē-an', -än', pyän), [key] — n. Pathol. yaws. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pia mater pianette Related Content Daily Word Quiz: maritime Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language