/ Dictionary / Index G greenstone: Meaning and Definition of Find definitions for: green•stone Pronunciation: (grēn'stōn"), [key] — n. any of various altered basaltic rocks having a dark-green color caused by the presence of chlorite, epidote, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. greenstick fracture green strength Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language