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



BrE BrE//ˈpɔːpəs//
; NAmE NAmE//ˈpɔːrpəs//
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a sea animal that looks like a large fish with a pointed mouth. Porpoises are similar to dolphins but smaller. Word OriginMiddle English: from Old French porpois, based on Latin porcus ‘pig’ + piscis ‘fish’, rendering earlier porcus marinus ‘sea hog’.
See the Oxford Advanced American Dictionary entry: porpoise