Definition of moving cluster in US English:

moving cluster

noun

Astronomy
  • 1An open cluster of stars which appear to share a common motion through space, and the distance of which can be determined from measurements of the motions of the individual stars.

  • 2Attributive Designating a method of determining the distance of such a star cluster by observing the radial velocities and proper motions of the individual stars.

Origin

Early 20th century. From moving + cluster.

Pronunciation

moving cluster

/ˌmuːvɪŋ ˈklʌstə/