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prothallus
prothesis
prothonotary
prothonotary warbler
prothoracic gland
prothrombin
protist
protium
proto-
Proto-Algonquian
Proto-Germanic
Proto-Indo-European
Proto-Norse
proto-oncogene
Proto-Romance
Proto-Semitic
protoceratops
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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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