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prothonotary warbler
prothoracic gland
prothrombin
protist
protium
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Proto-Algonquian
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Proto-Indo-European
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Proto-Indo-European
Pro·to-In·do-Eur·o·pe·an


noun 
Definition:
 
ancestor of Indo-European languages: a reconstructed hypothetical language that is believed to be the ancestor of all the Indo-European languages

Pro·to-In·do-Eur·o·pe·an adjective
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