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Meaning of prototherian

pro•to•the•ri•an

Pronunciation: (prō"tu-thēr'ē-un), [key]
— adj.
  1. belonging or pertaining to the group Prototheria, comprising the monotremes.
—n.
  1. a prototherian animal.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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