Noah Webster
Collet
COLLET, noun
1. Among jewelers, the horizontal face or plane at the bottom of brilliants; or the part of a ring in which the stone is set.
2. In glass-making, that part of glass vessels which sticks to the iron instrument used in taking the substance from the melting-pot.
3. Anciently, a band or collar.
4. A term used by turners.