Trident

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

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.