Might mean (unverified): Hypothetical massive black hole precursor.
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  1. quasistar: Wiktionary

Definitions from Wiktionary (quasistar)

noun:  (astronomy, cosmology) A theoretical early universe object, with the outer layers of a star and a black hole for a stellar core. Theorized to be born of an ultramassive pre-stellar nebula collapse to an ultramassive protostar, and later birthing an intermediate mass black hole when the star's life ends.

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