any of several chiefly marine, cetacean mammals of the family Delphinidae, having a fishlike body, numerous teeth, and the front of the head elongated into a beaklike projection.
2.
Also called dolphinfish, mahimahi, pompano dolphin.either of two large, slender fishes, Coryphaena hippurus or C. equisetis, of warm and temperate seas.
3.
Nautical.
a.
a pile, cluster of piles, or buoy to which a vessel may be moored in open water.
b.
a cluster of piles used as a fender, as at the entrance to a dock.
c.
a pudding fender at the nose of a tugboat or on the side of a vessel.
4.
(initial capital letter) Astronomy. the constellation Delphinus.
c.1350, from O.Fr. daulphin, from M.L. dolfinus, from L. delphinus "dolphin," from Gk. delphis (gen. delphinos) "dolphin," related to delphys "womb," probably via notion of the animal bearing live young. Popularly applied to the dorado from late 16c.