WordReference Random House Unabridged Dictionary of American English © 2026
o′pen clus′ter, [Astron.]
  1. Astronomya comparatively young, irregularly shaped group of stars, often numbering up to several hundred, and held together by mutual gravitation;
    usually found along the central plane of the Milky Way and other galaxies.
Also, galactic cluster. Cf. globular cluster, stellar association. 
'open cluster' also found in these entries (note: many are not synonyms or translations):
Hyades - bunchflower - cluster - galactic cluster - globular cluster - star cluster - stellar association

Forum discussions with the word(s) "open cluster" in the title:


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