monotreme
/ˈmɒnətɹiːm/
noun 1adj 1
Definitions
noun
1
Any of the order Monotremata of mammals that lay eggs and have single orifices for urogenital and digestive functions (cloaca); an echidna, platypus or one of their extinct relatives.
adj
1
Having a single trema, or aperture.
Nomotreme fern and moss spores are monotreme.
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