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[proh-toh-gal-uh k-see, proh-toh-gal-] /ˌproʊ toʊˈgæl ək si, ˈproʊ toʊˌgæl-/
noun, plural protogalaxies. Astronomy
the large concentration of gas and dust from which a galaxy is formed.
1945-50; proto- + galaxy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for protogalaxy


noun (pl) -axies
a cloud of gas in the early stages of its evolution into a galaxy
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Article for protogalaxy

in cosmology, vast cloud of gas that by contraction and condensation becomes a galaxy of stars. In evolutionary ("big-bang") models of creation, protogalaxies appear early in the expansion phase of the universe; in the steady-state model they are slowly but continually forming from newly created matter

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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