terrapin

noun
🔊/ˈterəpɪn/
🔊/ˈterəpɪn/
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  1. a small turtle (= a reptile with a hard round shell), that lives in warm rivers and lakes in North America 水龟(生活在北美温带江河湖泊中)compare tortoiseTopics Animalsc2
    Word Originearly 17th cent. (denoting the diamondback terrapin): of Algonquian origin.