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  1. Oxford American Dictionary

    dark matter

    • IPA[ˌdärk ˈmadər]

    美式

    • n.
      (in some cosmological theories) nonluminous material that is postulated to exist in space and that could take any of several forms including weakly interacting particles (cold dark matter) or high-energy randomly moving particles created soon after the Big Bang (hot dark matter).

    • noun: dark matter