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Woodruff key

American  

noun

Machinery.

  1. a key having the form of a nearly semicircular disk fitting into a recess in a shaft.

Woodruff key British  
/ ˈwʊdrʌf /

noun

  1. a semicircular key restrained in a curved keyway in a shaft

"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

Etymology

Origin of Woodruff key

Apparently after the proper name

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.