Definition of accretionary prism in English:

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accretionary prism

Pronunciation: /əˌkrēSHənerē ˈprizəm/
(also accretionary wedge)

noun

Geology
A mass of sedimentary material scraped off a region of oceanic crust during subduction and piled up at the edge of the overriding plate.
Example sentences
  • There is a continuing loss of some sediment into the mantle at subduction zones, although the ‘conveyor-belt’ system of plate tectonics ensures that most sediment is added to the accretionary wedge of the overriding plate.
  • This assemblage is interpreted as the accretionary prism of an active continental margin.
  • The most widely accepted view is that of an accretionary prism developed above an active subduction zone.

For editors and proofreaders

Syllabification: ac·cre·tion·ar·y prism

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