monotremous en · ADJ
Meanings
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(not-comparable) Related to the monotremes.
The monotremous section of the Implacentalia is represented as in Australia, by the well known Platypus, and by an Echidna or Ant-eater which appears to differ from our own in nothing but the shorter spines and more hairy fur.
1868, Gerard Krefft, Notes on the Fauna of Tasmania, page 6: