(1):

(a.) Having three teeth or prongs; tridentate.

(2):

(n.) A three-pronged fish spear.

(3):

(n.) A kind of scepter or spear with three prongs, - the common attribute of Neptune.

(4):

(n.) A curve of third order, having three infinite branches in one direction and a fourth infinite branch in the opposite direction.

(5):

(n.) A three-pronged spear or goad, used for urging horses; also, the weapon used by one class of gladiators.