Stud: A horse or a number of horses, usually for racing or hunting, bred or kept by one owner. A studhorse or stallion.
Stud: a knob, nailhead, or other protuberance projecting from a surface or part, especially as an ornament.
Stud: any of a large number of small projecting lugs embedded in an automobile tire (studded tire) to improve traction on snowy or icy roads.
Stud: a vertical member made of timber, steel, etc, that is used with others to construct the framework of a wall
Stud: An active, virile, muscular man (slang)
Stud: a variety of poker in which the first card is dealt face down before each player and the next four are dealt face up (five-card stud) or in which the first two cards and the last card are dealt face down and the intervening four cards are dealt face up (seven-card stud), with bets made after each round Often shortened to stud