Monotreme

//ˈmɒnətɹiːm// adj, noun

Definitions

Adjective
  1. 1
    Having a single trema, or aperture. not-comparable

    "Nomotreme fern and moss spores are monotreme."

Noun
  1. 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.
  2. 2
    the most primitive mammals comprising the only extant members of the subclass Prototheria wordnet

Etymology

Etymology 1

From mono- + -treme.

Etymology 2

From mono- + -treme.

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