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
4 tr (Jewellery) to mount in a collet
(C16: from Old French: a little collar, from col neckband, neck, from Latin collum neck)
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