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Morse taper

noun
  1. trademark engineering a taper that is one of a standard series used in the shank of tools to fit a matching taper in the mandrel of a machine tool
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Word Origin

probably named after the Morse Twist Drill Co, Massachusetts, US
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