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protracted
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protrude
protrusile
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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"]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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