noun a three-pronged fish spear.
2. trident ·adj having three teeth or prongs; tridentate.
3. trident ·noun a kind of scepter or spear with three prongs, the common attribute of neptune.
4. trident ·noun a three-pronged spear or goad, used for urging horses; also, the weapon used by one class of gladiators.
5. trident ·noun a curve of third order, having three infinite branches in one direction and a fourth infinite branch in the opposite direction.