concretions

1.凝结,固结;具体化

2.固结物;连生体;【医】结石;凝结物;硬块;【地】结核,凝岩

1.the process in which separate parts or particles come together into a solid mass

2.a hard solid mass formed by parts uniting into a whole

3.a mass of inorganic material in a body organ or tissue, usually caused by disease

4.a rounded mass of compact concentric layers within a sediment, built up around a nucleus such as a fossil