protogalaxy

noun
pro·​to·​gal·​axy | \ˌprō-tō-ˈga-lək-sē \

Definition of protogalaxy 

: a cloud of gas believed to be the precursor to a galaxy

First Known Use of protogalaxy

1950, in the meaning defined above

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The first known use of protogalaxy was in 1950

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