ALL meanings of protostar
pro·to·star
P p - noun protostar an early stage in the evolution of a star, after the beginning of the collapse of the gas cloud from which it is formed, but before sufficient contraction has occurred to permit initiation of nuclear reactions at its core. 1
- noun protostar a cloud of interstellar gas and dust that gradually collapses, forming a hot dense core, and evolves into a star once nuclear fusion can occur in the core 0
- noun protostar 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 0