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Noun: open cluster
  1. (astronomy) a more or less irregular star cluster containing tens to thousands of stars that are only loosely bound gravitationally

Derived forms: open clusters

Encyclopedia: Open cluster

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OPEC
op-ed
Opel
open
open access
open account
open air
open chain
open circuit
open cluster
open day
open door
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open fireplace
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open frame
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open letter
open marriage