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.

Also called dolphinfish , mahimahi , pompano dolphin . either of two large, slender fishes, Coryphaena hippurus or C. equisetis, of warm and temperate seas.

Nautical .

a pile, cluster of piles, or buoy to which a vessel may be moored in open water.

a cluster of piles used as a fender, as at the entrance to a dock.

a pudding fender at the nose of a tugboat or on the side of a vessel.

( initial capital letter ) Astronomy . the constellation Delphinus.