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  1. Oxford American Dictionary

    accretionary prism

    • IPA[əˌkrēSHənerē ˈprizəm]

    美式

    • n.
      a mass of sedimentary material scraped off a region of oceanic crust during subduction and piled up at the edge of the overriding plate.

    • noun: accretionary prism, plural noun: accretionary prisms