Protoplanets are large planetary embryos that originate within protoplanetary discs and have undergone internal melting to produce differentiated interiors. They are believed to form out of kilometer-sized planetesimals that attract each other gravitationally and collide. According to planet-formation theory, protoplanets perturb each other`s orb....
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http://en.wikipedia.org/wiki/Protoplanet
Gas, dust, and rocks that gradually becomes a whole planet.
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http://planetfacts.org/space-terms/
in astronomical theory, a hypothetical eddy in a whirling cloud of gas or dust that becomes a planet by condensation during formation of a solar ... [1 related articles]
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http://www.britannica.com/eb/a-z/p/124
A planet in the process of accretion from material in a protoplanetary disk. Protoplanets are believed to form planetesimals that draw together and aggregate through gravity.
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http://www.daviddarling.info/encyclopedia/P/protoplanet.html
the collection of matter, in the process of condensation, from which a planet is formed.
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https://www.infoplease.com/dictionary/protoplanet
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