monotreme
noun/ˈmɒnətriːm/
/ˈmɑːnətriːm/
(specialist)- a class of animal including the echidna and the platypus, that lays eggs, but also gives milk to its babiesTopics Animalsc2Word Originmid 19th cent.: from mono- ‘single’ + Greek trēma ‘hole’.
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monotreme