collet

collet

[kol-it]
noun
1.
a collar or enclosing band.
2.
the enclosing rim within which a jewel is set.
3.
a slotted cylindrical clamp inserted tightly into the tapered interior of a sleeve or chuck on a lathe to hold a cylindrical piece of work.
4.
Horology. the tiny collar that supports the inner terminal of a hairspring.
verb (used with object), colleted, colleting.
5.
to set (a gem or other stone) in a collet.

Origin:
1520–30; < French, equivalent to col neck (< Latin collum) + -et -et

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World English Dictionary
collet (ˈkɒlɪt)
 
n
1.  (in a jewellery setting) a band or coronet-shaped claw that holds an individual stone
2.  mechanical engineering an externally tapered sleeve made in two or more segments and used to grip a shaft passed through its centre when the sleeve is compressed by being inserted in a tapered hole
3.  horology a small collar that supports the inner end of the hairspring
 
vb
4.  (tr) jewellery to mount in a collet
 
[C16: from Old French: a little collar, from col neckband, neck, from Latin collum neck]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

collet
1520s, from Fr. collet, dim. of col "neck," from L. collum (see collar).
Online Etymology Dictionary, © 2010 Douglas Harper
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