supergalaxyn.

1916 F. R. Moulton Introd. Astron. (rev. ed.) xiii. 469 It was pointed out by Lambert long ago that..the Galaxy may be but a single one out of an enormous number of galaxies separated by distances which are very great in comparison with their dimensions, and that these galaxies may form larger units, or supergalaxies, and so on without limit.

1946 G. Gamow in Nature 19 Oct. 549/1 The realm of galaxies as seen through Mt. Wilson telescope represents only a small part of a much larger system (a ‘supergalaxy’ in the super-Shapley sense) rotating round a distant centre.

1955 Sci. Amer. Mar. 42/1 One source of radio emission, extending over a long path across the sky, coincides with the plane of the supergalaxy of which the Milky Way is a part.

1971 New Scientist 29 July 245/1 The Supergalaxy is, in turn, composed of smaller clusters of galaxies, including the local cluster of about a dozen members, our Galaxy being one of them.

2003 M. Roos Introd. Cosmol. (ed. 3) ix. 232 On smaller scale we observe matter to be distributed in galaxies, groups of galaxies, supergalaxies and strings of supergalaxies with great voids in between.