Etymology
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mandrel (n.)

"miner's pick," 1510s, of unknown origin; perhaps borrowed from French mandrin, itself of unknown origin. Also applied from 17c. to a bar or spindle, used chiefly to hold articles in place, on a lathe or a circular saw.

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Definitions of mandrel

mandrel (n.)
any of various rotating shafts that serve as axes for larger rotating parts;
Synonyms: spindle / mandril / arbor
From wordnet.princeton.edu