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

protoplanet Related Forms
pro′to·plan′etar′y (-i ter′ē) adjective
protoplanet Usage Examples

Noun used with modifier

  • earth: The image on the left shows a snapshot of a 30 Earth mass protoplanet embedded in a viscous, laminar disk model.