Definition of protoplanet Protoplanet
We found 2 definitions of protoplanet from 2 different sources.
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What does protoplanet mean?
Wiktionary 
- protoplanet (Noun)
An astronomical object, approximately the size of the Moon, formed from the mutual gravitational attraction of planetesimals; they are thought to collide with each other and slowly form planets.
OmegaWiki DictionaryOmegaWiki Dictionary Ω
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protoplanet
A large planetary embryo that originated within a protoplanetary disc and has undergone internal melting to produce a differentiated interior.
