Monotreme Definition
 mŏnə-trēm 
    noun
  
 Any of an order (Monotremata) of mammals, consisting of the platypus and the echidnas, which lay eggs and have a single opening for the digestive and urinary tracts and genital organs.
 Webster's New World 
Synonyms: 
  
- egg-laying mammal
    adjective
  
 (palynology, of a pollen grain) Having a single trema, or aperture.
Wiktionary 
Other Word Forms of Monotreme
Noun
Singular:
 monotremePlural:
 monotremesOrigin of Monotreme
-  From New Latin Monotrēmata order name mono– Greek trēma trēmat- perforation terə-1 in Indo-European roots From American Heritage Dictionary of the English Language, 5th Edition 
- mono- +"Ž -treme - From Wiktionary 
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