stud

noun

1.
a man who is virile and sexually active
2.
ornament consisting of a circular rounded protuberance (as on a vault or shield or belt)
Derived from:
stud
3.
an upright in house framing
Derived from:
stud
4.
adult male horse kept for breeding
5.
poker in which each player receives hole cards and the remainder are dealt face up; bets are placed after each card is dealt