WordReference Random House Learner's Dictionary of American English © 2015
dol•phin /ˈdɑlfɪn, ˈdɔl-/USA pronunciation n. [countable]
  1. Mammalsa small-toothed mammal of the sea having a beaklike nose and mouth. Compare porpoise.porpoise
  2. FishAlso called ˈdol•phinˌfish mahimahi. either of two large, slender fishes of warm and temperate seas.

Collins Concise English Dictionary © HarperCollins Publishers::

dolphin /ˈdɒlfɪn/ n
  1. 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
  2. river dolphinany 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

  3. 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
  4. 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:

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