protoplanet Hear it!

protoplanet definition

proto·planet (prōt′ō plan′it)

noun

in some cosmological theories, any of the hundreds of swirling clouds of dust and gas that form around a star and eventually evolve into individual planets

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Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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