adj, noun ·Uncommon ·Advanced level

Definitions

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

Adjective

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

   "Nomotreme fern and moss spores are monotreme."

Synonyms

All synonyms

1 treme1-tremeegg laying mammalegg-laying mammalmonoaperturatemonoaperturate

Example

More examples

"Nomotreme fern and moss spores are monotreme."

Etymology

From mono- + -treme.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.