Breadcrumb Home > Dictionary > Index W whinstone: Meaning and Definition of Find definitions for: whin•stone Pronunciation: (hwin'stōn", win'-), [key] — n. any of the dark-colored, fine-grained rocks, esp. igneous rocks, as dolerite and basalt. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: whinstone (Thesaurus) whinny whiny ✖ Related Content Daily Word Quiz: quadrumanous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language