trident

Từ điển Oxford Advanced Learner 8th

tri·dent [trident tridents] BrE [ˈtraɪdnt] NAmE [ˈtraɪdnt] noun
a weapon used in the past that looks like a long fork with three points

Word Origin:
late Middle English: from Latin trident-, from tri- ‘three’ dens, dent- ‘tooth’.