Prototherians'

prototherian

[proh-tuh-theer-ee-uhn]
adjective
1.
belonging or pertaining to the group Prototheria, comprising the monotremes.
noun
2.
a prototherian animal.

Origin:
1880–85; < Neo-Latin Prototheri(a) (< Greek prōto- proto- + thēría, plural of thēríon beast) + -an

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World English Dictionary
prototherian (ˌprəʊtəʊˈθɪərɪən)
 
adj
1.  of, relating to, or belonging to the Prototheria, a subclass of mammals that includes the monotremes
 
n
2.  any prototherian mammal; a monotreme
 
[C19: New Latin, from proto- + Greek theria wild animals]

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