名詞 collet:

1. a metal cap or band placed on a wooden pole to prevent splitting
   同義詞：ferrule
2. a cone-shaped chuck used for holding cylindrical pieces in a lathe
   同義詞：collet chuck
3. a band or collar that holds an individual stone in a jewellery setting

col.let

n.（名詞）
A cone-shaped sleeve used for holding circular or rodlike pieces in a lathe or other machine.
套爪：用以固著車床及其它機(jī)器中圓形或棒狀物件的錐形套筒
A metal collar used in watchmaking to join one end of a balance spring to the balance staff.
油絲固著環(huán)：制表過程中將平衡發(fā)條一端與平衡軸桿相連接的金屬環(huán)
A circular flange or rim, as in a ring, into which a gem is set.
寶石座：環(huán)形法藍(lán)盤或輪圈，用以在戒指上鑲嵌寶石

來源：
French [diminutive of] col [collar]
法語 [] col的小后綴 [衣領(lǐng)]
from Latin collum [neck] * see k wel-
源自 拉丁語 collum [頸] *參見 k wel-