dolphin

dol•phin n. [countable]

Mammalsa small-toothed mammal of the sea having a beaklike nose and mouth. Compare porpoise.
FishAlso called ˈdol•phinˌfish mahimahi. either of two large, slender fishes of warm and temperate seas.

dol•phin n.

Mammalsany 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.
FishAlso called dolphinfish, mahimahi. either of two large, slender fishes, Coryphaena hippurus or C. equisetis, of warm and temperate seas.
[Naut.]
- Naval Termsa pile, cluster of piles, or buoy to which a vessel may be moored in open water.
- Naval Termsa cluster of piles used as a fender, as at the entrance to a dock.
- Naval Termsa pudding fender at the nose of a tugboat or on the side of a vessel.
(cap.) [Astron.]the constellation Delphinus.

Collins Concise English Dictionary © HarperCollins Publishers::

dolphin /ˈdɒlfɪn/ n

any of various marine cetacean mammals of the family Delphinidae, esp Delphinus delphis, that are typically smaller than whales and larger than porpoises and have a beaklike snout
river dolphin ⇒ any freshwater cetacean of the family Platanistidae, inhabiting rivers of North and South America and S Asia. They are smaller than marine dolphins and have a longer narrower snout
Also called: dorado either of two large marine percoid fishes, Coryphaena hippurus or C. equisetis, that resemble the cetacean dolphins and have an iridescent coloration
a post or buoy for mooring a vessel

Etymology: 13th Century: from Old French dauphin, via Latin, from Greek delphin-, delphis

'dolphin' also found in these entries (note: many are not synonyms or translations):

Collocations: a [bottlenose, spinner] dolphin, went swimming with dolphins, [saw, observed] dolphins in the ocean, more...

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