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A subclass of Mammalia, having a cloaca in which the ducts of the urinary, genital, and alimentary systems terminate, as in birds. The female lays eggs like a bird. See Duck mole, under Duck, and Echidna.

and a bill resembling that of a duck (Ornithorhynchus anatinus). It belongs the subclass Monotremata and is remarkable for laying eggs like a bird or reptile; -- called also duckbill, platypus, mallangong, mullingong, tambreet, and water mole. -- To make ducks and drakes, to throw a flat stone obliquely, so as to mak…

A genus of Monotremata found in Australia, Tasmania, and New Guinea. They are toothless and covered with spines; -- called also porcupine ant-eater, and Australian ant-eater.

Of or pertaining to the Monotremata.

One of the Monotremata.

Same as Monotremata. -- Or`ni*tho*del"phid, a.

Same as Monotremata.