tri ‧ dent /ˈtraɪd ə nt/ BrE AmE noun [countable]
[ Date: 1400-1500 ; Language: Latin ; Origin: tridens 'having three teeth' , from tri- + dens 'tooth' ]
1 . a weapon with three points that looks like a large fork
2 . Trident missile/submarine a type of ↑ nuclear weapon, or the ↑ submarine that shoots it