Wiktionary
n. (plural of protostar English)
Wikipedia
Protostars is an anthology of science fiction short stories edited by David Gerrold and Stephen Goldin. It was first published in paperback by Ballantine Books in October 1971, and has been reprinted a number of times since.
The book collects sixteen novelettes and short stories by various science fiction authors, including a few by the editors, with an introduction by Gerrold.
Usage examples of "protostars".
Infalling matter adds to their mass, until a family of protostars is formed.
But to those left stranded between the dying protostars, it was a terrible abandonment.
That darker area all around the glow, eclipsing the stars behind, is a glimpse of the true nebula, dense clouds of dust and hydrogen, probably containing protostars that have yet to shine .