1. (an) accumulation, a pile;〔地質学で〕sedimentation

    堆積する pile [build] up; accumulate

    • 道路の泥の堆積をかたづけた
    • They cleared the streets of the (heaps of) mud./They removed the mud which had accumulated on the roads.
    • 膨大な資料が堆積していた
    • A huge amount of data had accumulated [piled up]./《口》 There were heaps of materials.
  1. 堆積岩a sedimentary rock
  1. 堆積物sediment; a deposit