Lexical Definition

‎נֶקֶב‎ neqeb (neh'keb) socket ^H:N-M
pipe.

• a bezel (for a gem)

1) groove, socket, hole, cavity, settings
1a) technical term relating to jeweller's work

Brown-Driver-Briggs

I. [‎נֶ֫קֶב‎] noun [masculine] technical term of jeweller's work, probably some hole or cavity (Hi-Sm Co Berthol; Toy^{Hpt leaves untranslated}), — only plural suffix ‎תֻּפֶּיךָ וּנְקָבֶיךָ‎ Ezek 28:13 thy sockets and thy grooves (Da), or thy settings and thy sockets.

Brown-Driver-Briggs References