tri·dent /ˈtraɪdṇt/
  三叉戟,三叉曲線,三叉魚叉(a.)三叉的
  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.
  Tri·dent, a.  Having three teeth or prongs; tridentate.
  ◄ ►
  trident
       n : a spear with three prongs