protogalacticadj.
/ˌprəʊtə(ʊ)ɡəˈlaktɪk/, U.S. /ˈˌproʊdoʊɡəˈlæktɪk/ Astronomy.
Of, relating to, or of the nature of a protogalaxy.
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the world > the universe > constellation > galaxy > [adjective] > protogalaxy
protogalactic1969
1969 Monthly Notices Royal Astron. Soc. 145 407 We assume for simplicity that the proto-galactic material consists of pure hydrogen.
1983 J. D. Barrow & J. Silk Left Hand of Creation iv. 144 Only after a galaxy has fallen through the full gravitational potential of the forming cluster will it attain full speed. This marks the end of the protogalactic phase of evolution.
2004 Adv. Space Res. 34 632/2 Were these clouds clumped in protogalactic structures or more loosely organized?
This entry has been updated (OED Third Edition, September 2007; most recently modified version published online March 2022).
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adj.1969