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  1. Oxford Dictionary

    cloud chamber

    • n.
      a device containing air or gas supersaturated with water vapour, used to detect charged particles, X-rays, and gamma rays by the condensation trails which they produce.

    • noun: cloud chamber, plural noun: cloud chambers

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    cloud chamber

    • IPA[ˈkloud ˌCHāmbər]
    • n.
      a device that contains air or gas supersaturated with water vapor and that is used to detect ...

    Oxford American Dictionary