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Entry 3 senses Webster, 1913

Concretion

· Con·cre·tion · IPA
01 n. The process of concreting; the process of uniting or of becoming united, as particles of matter into a mass; solidification.
  1. 1.
    The process of concreting; the process of uniting or of becoming united, as particles of matter into a mass; solidification.
  2. 2.
    A mass or nodule of solid matter formed by growing together, by congelation, condensation, coagulation, induration, etc.; a clot; a lump; a calculus.
    “Accidental ossifications or deposits of phosphates of lime in certain organs . . . are called osseous concretions.” — Dunglison.
  3. 3.
    A rounded mass or nodule produced by an aggregation of the material around a center; as, the calcareous concretions common in beds of clay.(Geol.)