Wiktionary
protostellar
a. (context astronomy English) Of or pertaining to a protostar.
Usage examples of "protostellar".
Any attack fleet would have to jump around the Queen’s Head Nebula, an effectively impassable cloud within which three or four protostellar objects were forming.
A condensing protostellar cloud-rich in heavy elements synthesized in other stars, flung throughout a gravita-tionally unstable cosmos which starts and ends in singularities.