protostar Hear it!

protostar definition

proto·star (prōt′ō stär′)

noun

in some cosmological theories, any of the millions of swirling clouds of dust and hydrogen gas that form within a protogalaxy and eventually evolve into thermonuclear stars

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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