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  1. 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.
  2. 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 ...