/ Dictionary / Index G groining: Meaning and Definition of Find definitions for: groin•ing Pronunciation: (groi'ning), [key] — n. the intersection of two vaults. the construction of groined vaults. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: groining (Thesaurus) groin grok Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language