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n. pl. su·per·gal·ax·ies
A very large group of galaxies.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˈsu pərˌgæl ək si)

n., pl. -ax•ies.
a system of galaxies.
su`per•ga•lac′tic (-gəˈlæk tɪk) adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
A supergalaxy harbouring an ultramassive remnant dark hole would be the inevitable outcome of hierarchical galaxy mergers.
The pair will orbit the supergalaxy a number of times but will ultimately fall in and suffer the same fate as many other satellite galaxies: cannibalization.
Recently, refreshing my memory of "superego," which a now former friend had tossed at me, I noticed that the top of its page [1292] in the dictionary I had grabbed [Random House Webster's College Dictionary (New York: Random House, 1997)] was labeled "sunspot to supergalaxy." I smiled: an astronomer's delight, without doubt.