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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

2. • 釋義

   n.

   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.
3. • 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