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protocontinent
protoctist
protogalaxy
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protuberant

pro·tu·ber·ant [ prō tbərənt ]


adjective 
Definition:
 
bulging out: sticking out from the surroundings in a bulging rounded manner

[Mid-17th century. < late Latin protuberant-, present participle of protuberare "swell forward" < Latin tuber "lump"]

pro·tu·ber·ant·ly adverb
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