protosunn.
/ˈprəʊtə(ʊ)sʌn/, U.S. /ˈproʊdoʊˌsən/ Astronomy.
The sun at an early stage of its formation, before becoming dense enough to sustain nuclear reactions.
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protosun1949
1949 Sci. Monthly Feb. 89/1 In the course of time these minor clusters..are gradually drawn into the central mass, the ‘proto-sun’.
1988 T. Ferris Coming of Age in Milky Way (1989) i. ix. 167 The first such extragalactic supernova to be noticed..could be explained away as the sputtering of a Laplacian protosun.
1999 Science 27 Aug. 1380/1 A primitive group of meteorites that formed 4.56 billion years ago within the solar nebula, a dynamic, disk-shaped region of dust and gas with the protosun at its center.
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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n.1949