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protoplanet
protoplasm
protoplast
protoporphyrin
protostar
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prototherian
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prototype
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protuberate

pro·tu·ber·ate [ prō tbə ràyt ] (past and past participle pro·tu·ber·at·ed, present participle pro·tu·ber·at·ing, 3rd person present singular pro·tu·ber·ates)


intransitive verb 
Definition:
 
swell out: to stick out from the surroundings in a bulging rounded manner

[Late 16th century. < Latin protuberat-, past participle of protuberare (see protuberant)]
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