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field galaxyAny galaxy that is not a member of a cluster of galaxies. Field galaxies are rare: the ratio of field galaxies to cluster galaxies is extremely uncertain, estimates ranging from 1:6 to essentially zero.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
field galaxy[′fēld ‚gal·ik·sē]
An isolated galaxy that does not belong to a cluster.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.