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Added 9 October 2026

monotreme

/ˈmɒnətɹiːm/ noun

In Latin: monotrēma Wiktionary

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about monotreme at Wordnik → Where our words come from →

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.

adjective

Having a single trema, or aperture.

Origin

From mono- (“one”) + -treme (“hole”).

From Wiktionary, via Kaikki.org (CC BY-SA)

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