subcluster

noun
sub·​clus·​ter | \ˌsəb-ˈklə-stər \
variants: or sub-cluster
plural subclusters or sub-clusters

Definition of subcluster 

: a cluster that is a subdivision of a larger cluster … all objects are initially assigned to a single cluster and then are split into smaller subclusters.— Tony H. Grubesic et al. A detailed look at the Virgo cluster reveals that its constituent galaxies are not concentrated smoothly toward the center of the cluster. Instead, some of the galaxies are clumped together into subclusters within the main cluster.— A. J. Meadows

First Known Use of subcluster

1868, in the meaning defined above

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The first known use of subcluster was in 1868

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