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protocloud
protocloud n. 
/ˈproʊdəˌklaʊd/ Astronomy a mass of gas and dust from which a galaxy is thought to develop; a protogalaxy.
Brit. /ˈprəʊtə(ʊ)klaʊd/
, /ˈprəʊtə(ʊ)klaʊd/U.S. /ˈproʊdoʊˌklaʊd/
, /ˈproʊdoʊˌklaʊd//ˈproʊdəˌklaʊd/ΘΚΠ
the world > the universe > constellation > galaxy > [noun] > protogalaxy
protocluster1953
protogalaxy1953
protocloud1970
1970 Nature 31 Oct. 412/1 A protocloud formed at that time would initially expand with the Universe, but at a reduced rate.
1988 Monthly Notices Royal Astron. Soc. 233 867 Heavy elements in the protocloud are locked up in dust grains.
2001 P. Coles Routledge Compan. New Cosmol. ii. 336 This led to two distinct scenarios for structure formation [in the Universe]: 1. The adiabatic scenario... 2. The isothermal scenario, in which the first structures, protoclouds or protogalaxies, are formed on a much smaller mass scale.
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