| 单词 | monotreme |
| 释义 | Word Frequency monotreme(ˈmɒnəʊˌtriːm) noun any mammal of the primitive order Monotremata, of Australia and New Guinea: egg-laying toothless animals with a single opening (cloaca) for the passage of eggs or sperm, faeces, and urine. The group contains only the echidnas and the platypus Derived forms monotrematous (ˌmɒnəʊˈtriːmətəs) adjective Word origin C19: via New Latin from mono- + Greek trēma hole |
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