/ Dictionary / Index P plainstones: Meaning and Definition of Find definitions for: plain•stones Pronunciation: (plān'stōnz"), [key] — n.pl. Scot. flagstones. a flagstone walk or passageway. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. plain-spoken plain suit Related Content Daily Word Quiz: spectral Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language