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collet

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noun col·let \ ˈkä-lət \

Definition of collet

:a metal band, collar, ferrule, or flange: such as
a :a casing or socket for holding a tool (such as a drill bit)
b :a circle or flange in which a gem is set

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Origin and Etymology of collet

Middle French, diminutive of col collar, from Latin collum neck — more at collar

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