Breadcrumb Home > Dictionary > Index G greywacke: Meaning and Definition of Find definitions for: grey•wacke Pronunciation: (grā'wak", -wak"u), [key] — n. graywacke. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. grey plover GRF ✖ Related Content Daily Word Quiz: quadrumanous Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language