from the GNU version of the Collaborative International Dictionary of English
- n.pl. Same as monotremata.
from The Century Dictionary and Cyclopedia
- The lowest one of three subclasses of the class Mammalia, represented by the monotremes or oviparous mammals, and conterminous with the order Monotremata: so called from the ornithic character of the reproductive or urogenital organs.
Sorry, no etymologies found.