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  1. Oxford American Dictionary

    concretion

    • IPA[kənˈkrēSHən]

    美式

    • 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 a mass of small concretions, each built up layer upon layer around some small nucleus
    • ▪ the process by which matter forms into a concretion.
    • 更多解釋

    concretion

    • IPA[kənˈkriːʃ(ə)n]

    英式

    • n.
      a hard solid mass formed by the local accumulation of matter, especially within the body or ... nodular concretions of siderite growing within the sediments

    Oxford Dictionary

  4. 知識+

    • science自然問題

      ... ocean trend *3. The rock may melt under very high temperature, and when concretion the color of rock varies. 4. The hard particles in air ...

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