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| mon·o·treme [ mónnə trm ] (plural mon·o·tremes) |
noun |
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| Definition: |
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egg-laying mammal: a mammal such as the duck-billed platypus or echidna that lays eggs and has a single opening for the discharge of feces and urine. Order Monotremata.
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| [Mid-19th century. <mono- + Greek trēma "hole"] |
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