Noun
(astrophysics) Synonym of stellar black hole
(physics) Synonym of frozar A proposed theoretical alternative to black holes.
(astronomy) A proposed theoretical type of Population 0 star, which could exist in the far future, with a very high metallicity allowing for stars with very low mass, resulting in a nuclear fusion cored star with a surface temperature close to the triple-point of water.
Source: en.wiktionary.org