/ 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: stringent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language