Woodruff key

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

apparently after the proper name

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World English Dictionary
Woodruff key (ˈwʊdrʌf)
a semicircular key restrained in a curved keyway in a shaft
[C19: named after the Woodruff Manufacturing Co, in Hartford, Connecticut, who first manufactured it in 1892]

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