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

porpoise

noun

/ˈpɔːpəs/

/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.Topics Animalsc2
Word OriginMiddle English: from Old French porpois, based on Latin porcus ‘pig’ + piscis ‘fish’, rendering earlier porcus marinus ‘sea hog’.

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See porpoise in the Oxford Advanced American Dictionary

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