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protomorphic
proton
proton number
proton pump
proton pump inhibitor
proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
protostar
protostome
prototherian
prototrophic
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protocontinent
pro·to·con·ti·nent [ prtō kóntənənt ] (plural pro·to·con·ti·nents)


noun 
Definition:
 
1. landmass that could become continent: a large unbroken mass of land capable of becoming a major continent
2. geology 
Same as  supercontinent
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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