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  1. Oxford American Dictionary

    midocean ridge

    • IPA[ˌmidōSH(ə)n ˈrij]

    美式

    • n.
      a long, seismically active submarine ridge system situated in the middle of an ocean basin and marking the site of the upwelling of magma associated with seafloor spreading. An example is the Mid-Atlantic Ridge.

    • noun: mid-ocean ridge, plural noun: mid-ocean ridges