Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Belonging or pertaining to the subclass Prototheria of monotremes.
  • n. Any of the egg-laying mammals of the subclass Prototheria; a monotreme.

from The Century Dictionary and Cyclopedia

  • Primitively mammalian; primeval or ancestral, as a mammal; of or pertaining to the Prototheria in either sense.
  • n. A member of the Prototheria, hypothetical or actual.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. primitive oviparous mammals found only in Australia and Tasmania and New Guinea

Etymologies

From Prototheria, from Ancient Greek πρωτο- (proto-, "proto-, first") + θηρίον (thērion, "beast"). (Wiktionary)

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