trident

 
Pronunciation: /ˈtrʌɪd(ə)nt/

noun

  • 1a three-pronged spear, especially as an attribute of Poseidon (Neptune) or Britannia.
  • 2 (Trident) a US design of submarine-launched long-range ballistic missile.

Origin:

late Middle English: from Latin trident-, from tri- 'three' + dens, dent- 'tooth'