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protoplanet

[proh-toh-plan-it] /ˈproʊ toʊˌplæn ɪt/
noun, Astronomy
1.
the collection of matter, in the process of condensation, from which a planet is formed.
Origin of protoplanet
1945-1950
1945-50; proto- + planet
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Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for protoplanet

protoplanet

/ˌprəʊtəʊˈplænɪt/
noun
1.
a planet in its early stages of evolution by the process of accretion
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for protoplanet
n.

1949, from proto- + planet.

Online Etymology Dictionary, © 2010 Douglas Harper
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