Breadcrumb Home > Dictionary Cite Meaning of pin wrench Find definitions for: pin' wrench" Pronunciation: [key] a wrench having a pin for insertion into the heads of certain bolts to drive them. Cf.(def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pinworm pinx. Related Content Daily Word Quiz: erpsichore Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language