noun Machinery.
a shaft or bar the end of which is inserted into a workpiece to hold it during machining.
a spindle on which a circular saw or grinding wheel rotates.
the driving spindle in the headstock of a lathe.
Also, mandril.

1510–20; perhaps akin to French mandrin Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
mandrel or mandril (ˈmændrəl)
1.  a spindle on which a workpiece is supported during machining operations
2.  a shaft or arbor on which a machining tool is mounted
3.  the driving spindle in the headstock of a lathe
4.  (Brit) a miner's pick
[C16: perhaps related to French mandrin lathe]
mandril or mandril
[C16: perhaps related to French mandrin lathe]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

"miner's pick," 1510s, of unknown origin. Also applied from 17c. to parts of a lathe or a circular saw.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

mandrel man·drel or man·dril (mān'drəl)

  1. A shaft on which a working tool is mounted, as in a dental drill.

  2. See mandrin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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