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  1. Oxford Dictionary

    concretion

    • IPA[kənˈkriːʃ(ə)n]

    英式

    • n.
      a hard solid mass formed by the local accumulation of matter, especially within the body or within a mass of sediment；the process by which matter forms into a concretion.

    • noun: concretion, plural noun: concretions

    • 釋義

    名詞

    • 1. a hard solid mass formed by the local accumulation of matter, especially within the body or within a mass of sediment nodular concretions of siderite growing within the sediments
    • ▪ the process by which matter forms into a concretion.