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protocol statement
protocontinent
protoctist
protogalaxy
protohuman
protoindustrialization
protolanguage
protolithic
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protomorphic
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prototherian
pro·to·the·ri·an [ prtō three ən ] (plural pro·to·the·ri·ans)


noun 
Definition:
 
platypus or echidna: an echidna, platypus, or one of many extinct related mammals. Subclass Prototheria.
[Late 19th century. <proto- + Greek therion "wild animal"]
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