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Related to prototherian: metatherian
(Animals) of, relating to, or belonging to the Prototheria, a subclass of mammals that includes the monotremes
(Animals) any prototherian mammal; a monotreme
[C19: New Latin, from proto- + Greek thēria wild animals]
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|Noun||1.||prototherian - primitive oviparous mammals found only in Australia and Tasmania and New Guinea|
mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk