- trademark a large wrench having adjustable jaws that tighten as the pressure on the handle is increased
WordReference Random House Unabridged Dictionary of American English © 2026
Still′son wrench′
(stil′sən),USA pronunciation [Trademark.]
- Building, Trademarksa monkey wrench with a pivoted, adjustable jaw that grips pipes, bars, etc., more tightly when pressure is exerted on the handle.
Collins Concise English Dictionary © HarperCollins Publishers::
Stillson wrench /ˈstɪlsən/ n