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proton synchrotron
protonema
protonics
protonotary
protoplanet
protoplasm
protoplast
protoporphyrin
protostar
protostome
prototherian
prototrophic
prototype
protoxide
protozoan
protozoology
protozoon
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protolanguage
pro·to·lan·guage [ prṓtō làng gwij ] (plural pro·to·lan·guages)


noun 
Definition:
 
ancestor of language: a recorded or reconstructed language that is the ancestor of another language or family of languages
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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