trident
n.
"three-pointed spear," mid-15c., from Latin noun use of adjective tridentem (nominative tridens) "three-pronged, three-toothed," from tri- "three" (see tri-) + dens "tooth" (see tooth). As a type of U.S. nuclear-powered submarine, recorded from 1972. Related: Tridental.
〔李〕[tri-=three三；dent=tooth齿 →] n.a spear with three prongs三叉戟
〔李〕[tri-;dent] n.三叉戟； a.三叉的 ←dent (L dens,dentis)=tooth 齿
〔蒋〕[tri-三，dent牙；“有三叉齿形”的矛] 三叉戟，三叉尖器