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protoplanetOne entry found for protoplanet. Main Entry: pro·to·plan·et Pronunciation: 'prO-tO-"pla-n&t Function: noun : a hypothetical whirling gaseous mass within a giant cloud of gas and dust that rotates around a sun and is believed to give rise to a planet - pro·to·plan·e·tary /"prO-tO-'pla-n&-"ter-E/ adjective
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