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