A kind of scepter or spear with three prongs, -- the common attribute of Neptune. [1913 Webster]
A three-pronged spear or goad, used for urging horses; also, the weapon used by one class of gladiators. [1913 Webster]
A three-pronged fish spear. [1913 Webster]
A curve of third order, having three infinite branches in one direction and a fourth infinite branch in the opposite direction. [1913 Webster]

Trident bat (Zoöl.), an Asiatic rhinolophid bat (Triænops Persicus), having the nose membrane in the shape of a trident.

Trident, a. [L. tridens.].

Having three teeth or prongs; tridentate. [1913 Webster]

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OXFORD DICTIONARY

Trident, n.
1 a three-pronged spear, esp. as an attribute of Poseidon (Neptune) or Britannia.
2 (Trident) a US type of submarine-launched ballistic missile.

Etymology

L tridens trident- (as TRI-, dens tooth)

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THESAURUS

Trident

V, branch, clover, crotch, crutch, delta, deltoid, deuce-ace, fan, fork, furcula, furculum, groin, inguen, leash, offshoot, prong, ramification, set of three, shamrock, stem, tercet, ternary, ternion, terzetto, three, three-cornered, three-dimensional, three-footed, three-pronged, three-sided, threesome, tierce, trefoil, trey, triad, trialogue, triangle, triangular, triangulate, triarch, trichotomous, tricorn, tricornered, tricuspid, tridental, triennium, trifid, triflorate, triflorous, trifurcate, trigonal, trigonoid, trigrammatic, trihedral, trihedron, trilateral, trilogy, trimerous, trimester, trine, trinity, trinomial, trio, triparted, tripartite, triphthong, triple crown, triple threat, triplet, triplopy, tripod, tripodic, triptych, triquetral, triquetrous, trireme, trisected, triseme, triskelion, trisul, triumvirate, triunity, trivet, troika, wishbone

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ROGET THESAURUS

Trident

Triality

N triality, trinity, triunity, three, triad, triplet, trey, trio, ternion, leash, shamrock, tierce, spike-team, trefoil, triangle, trident, triennium, trigon, trinomial, trionym, triplopia, tripod, trireme, triseme, triskele, triskelion, trisula, third power, cube, cube root, three, triform, trinal, trinomial, tertiary, ternary, triune, triarch, triadie, triple, tri-, tris-, tria juncta in uno.

Ocean

N sea, ocean, main, deep, brine, salt water, waves, billows, high seas, offing, great waters, watery waste, vasty deep, wave, tide, hydrography, hydrographer, Neptune, Poseidon, Thetis, Triton, Naiad, Nereid, sea nymph, Siren, trident, dolphin, oceanic, marine, maritime, pelagic, pelagian, seagoing, hydrographic, bathybic, cotidal, at sea, on sea, afloat.

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