Webster's English Dictionary

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cluster

1. clus.ter \kl*s-t*r\ \-t(*-)re-\ n [ME, fr. OE clyster; akin to OE clott 
   clot] 1: a number of similar things growing together or of things or 
   persons coll ected or grouped closely together : BUNCH 2: two or more 
   consecutive consonants or vowels in a segment of speech  - clus.tery aj
2. cluster \-t(*-)rin\ vb or clus.ter.ing 1: to collect into a cluster  2: 
   to furnish with clusters  : to grow or assemble in a cluster