Tri·dent n.
 1. Class Myth. A kind of scepter or spear with three prongs, -- the common attribute of Neptune.
 2. Rom. Antiq. A three-pronged spear or goad, used for urging horses; also, the weapon used by one class of gladiators.
 3. A three-pronged fish spear.
 4. Geom. A curve of third order, having three infinite branches in one direction and a fourth infinite branch in the opposite direction.
 Trident bat Zool., an Asiatic rhinolophid bat (Triaenops Persicus), having the nose membrane in the shape of a trident.