bezel
/ˈbezəl/noun
- a grooved ring holding the cover of a watch face or other instrument in position固定手表（或其他仪表）表面盖的环形凹槽。
- a groove holding the crystal of a watch or the stone of a gem in its setting镶嵌手表水晶（或宝石）的凹形底座。
词源
late 16th cent.: from Old French, of unknown origin.