Englishaccretionary prismnounMeaningThe accumulation of surface sediment formed between a subducting oceanic crustal plate and a continental tectonic plate, as it is scraped from off the top of the oceanic crustal plate.Related wordsaccretion disk(English)upwarp(English)apside(English)wedge(English)hyperprism(English)diapirism(English)downwarp(English)roof prism(English)SourcesDictionaryAPI.dev English dictionary data