From Longman Dictionary of Contemporary Englishtridenttri‧dent /ˈtraɪdənt/ noun [countable] 1 PMWa weapon with three points that looks like a large fork2 → Trident missile/submarineTridentTrident1 trademark a powerful type of missile developed in the US. It carries nuclear explosives, is fired from submarines, and can attack several different places at the same time.TridentTrident2 trademark a type of chewing gum without any sugar in it, sold in the USOrigin trident (1400-1500) Latin tridens “having three teeth”, from tri- + dens “tooth”