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2 definitions found
 for concretion
From The Collaborative International Dictionary of English v.0.48 :

  Concretion \Con*cre"tion\, n. [L. concretio.]
     1. The process of concreting; the process of uniting or of
        becoming united, as particles of matter into a mass;
        solidification.
        [1913 Webster]
  
     2. A mass or nodule of solid matter formed by growing
        together, by congelation, condensation, coagulation,
        induration, etc.; a clot; a lump; a calculus.
        [1913 Webster]
  
              Accidental ossifications or deposits of phosphates
              of lime in certain organs . . . are called osseous
              concretions.                          --Dunglison.
        [1913 Webster]
  
     3. (Geol.) A rounded mass or nodule produced by an
        aggregation of the material around a center; as, the
        calcareous concretions common in beds of clay.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  concretion
      n 1: the formation of stonelike objects within a body organ
           (e.g., the kidneys)
      2: a hard lump produced by the concretion of mineral salts;
         found in hollow organs or ducts of the body; "renal calculi
         can be very painful" [syn: calculus, concretion]
      3: an increase in the density of something [syn: compaction,
         compression, concretion, densification]
      4: the union of diverse things into one body or form or group;
         the growing together of parts [syn: coalescence,
         coalescency, coalition, concretion, conglutination]

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