prototherian

US:USA pronunciation: respellingUSA pronunciation: respelling(prō′tə thēr′ē ən)


WordReference Random House Unabridged Dictionary of American English © 2026
pro•to•the•ri•an  (prō′tə thēr′ē ən),USA pronunciation adj. 
  1. Mammalsbelonging or pertaining to the group Prototheria, comprising the monotremes.

n. 
  1. Mammalsa prototherian animal.
  • Greek prōto- proto- + thēría, plural of thēríon beast) + -an
  • Neo-Latin Prototheri(a) (
  • 1880–85

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