Definition of dolphin noun from the Oxford Advanced Learner's Dictionary

 

dolphin

 noun
noun
BrE BrE//ˈdɒlfɪn//
 
; NAmE NAmE//ˈdɑːlfɪn//
 
Wild mammals
 
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a sea animal (a mammal ) that looks like a large fish with a pointed mouth. Dolphins are very intelligent and often friendly towards humans. There are several types of dolphin. a school of dolphins compare porpoise See related entries: Wild mammals Word Origin late Middle English: from Old French dauphin, from Provençal dalfin, from Latin delphinus, from Greek delphin.
See the Oxford Advanced American Dictionary entry: dolphin