Definition of protostar in English:

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protostar

Pronunciation: /ˈprōdəˌstär/

noun

Astronomy
A contracting mass of gas that represents an early stage in the formation of a star, before nucleosynthesis has begun.
Example sentences
  • Elongated chains of dust grains like these appear in the early stages of planet formation around a young protostar, according to a microgravity experiment inside a rocket.
  • By peering in wavelengths not visible to the naked eye, through the nebula's gas and dust, astronomers can identify very young stars and even protostars - those that are about to light up, once the gases reach a critical density.
  • Rotation forces some of the matter to accumulate in a disk rotating around the protostar (s).

For editors and proofreaders

Syllabification: pro·to·star

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