Definition of prototherian in English:


Syllabification: pro·to·the·ri·an
Pronunciation: /ˌprōtəˈTHirēən


  • A mammal of the group Prototheria, which comprises the monotremes and their extinct relatives.
    More example sentences
    • Extant mammals, including prototherians (egg-laying mammals) and therians (marsupial and placental mammals), probably last shared a common ancestor about 160 million years ago.


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  • Relating to or denoting prototherians.
    More example sentences
    • In his classification of prototherian mammals Hopson queried the allocation of Haramiyidae to the Multituberculata.
    • They had a common ancestor more recently than either had with the monotremes or, probably, any other prototherian group.

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