stud

A small object that protrudes from something; an ornamental knob.

(jewelry) A small round earring.

(construction) A vertical post, especially one of the small uprights in the framing for lath and plaster partitions, and furring, and upon which the laths are nailed.

(obsolete) A stem; a trunk.

(poker) A type of poker where an individual cannot throw cards away and some of her cards are exposed.

(engineering) A short rod or pin, fixed in and projecting from something, and sometimes forming a journal.

(engineering) A stud bolt.

An iron brace across the shorter diameter of the link of a chain cable.