/ Dictionary / Index P pitchstone: Meaning and Definition of Find definitions for: pitch•stone Pronunciation: (pich'stōn"), [key] — n. a glassy volcanic rock having a resinous luster and resembling hardened pitch. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pitchstone (Thesaurus) pitch shot pitch surface Related Content Daily Word Quiz: serendipity Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language