Stillson wrench
[ stil-suh n ]
/ ˈstɪl sən /
Trademark.
a monkey wrench with a pivoted, adjustable jaw that grips pipes, bars, etc., more tightly when pressure is exerted on the handle.
British Dictionary definitions for stillson wrench
Stillson wrench
/ (ˈstɪlsən) /
noun
trademark
a large wrench having adjustable jaws that tighten as the pressure on the handle is increased