Definition of treys:
(n) :
A male given name from English of modern usage, derived from the nickname.
(n) :
A nickname for someone who is the third person in the family sharing his father's name.
(n) :
(card games, occasionally dice games) A playing card or die with the rank of three.
(n) :
(card games, dice games, dominoes) A score of three in cards, dice, or dominoes.
(n) :
(US, Canada, basketball, informal, obsolete) A three-pointer.
(n) :
The third branch of a deer's antler.