n.
Pronunciation: ' kl ə s-t ə r
Function: noun
Etymology: Middle English, from Old English clyster; akin to Old English clott clot
Date: before 12th century
: a number of similar things that occur together: as a : two or more consecutive consonants or vowels in a segment of speech b : a group of buildings and especially houses built close together on a sizable tract in order to preserve open spaces larger than the individual yard for common recreation c : an aggregation of stars or galaxies that appear close together in the sky and are gravitationally associated d : a larger than expected number of cases of disease (as leukemia) occurring in a particular locality, group of people, or period of time
– clus · tery \ -t( ə -)r ē \ adjective