Stillson wrench

[ stil-suhn ]
/ 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.

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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
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012