Definitions

from The Century Dictionary.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

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