concretion

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. The act or process of concreting into a mass; coalescence.
2. n. The state of having been concreted: a concretion of seminal ideas in her treatise.
3. n. A solid hard mass.
4. n. Geology A rounded mass of mineral matter found in sedimentary rock.
5. n. Pathology A solid mass, usually composed of inorganic material, formed in a cavity or tissue of the body; a calculus.

Century Dictionary and Cyclopedia

1. n. The act of growing together or becoming united in one mass; concrescence; coalescence.
2. n. A mass of solid matter formed by a growing together, or by congelation, condensation, coagulation, conglomeration, or induration; a clot; a lump; a nodule: as, “concretions of slime,”
3. n. Specifically In geology, an aggregation of mineral matter, usually calcareous or silicious, in concentric layers, so arranged as to give rise to a form approaching the spherical, but often much flattened. This often takes place about some organic nucleus, the decomposition of which seems in such cases to be the cause of the structure. Concretions are common in sandstones, shales, and clays.
4. n. In logic: The state of being concrete; concreteness.
5. n. The act of determination, or of rendering a concept more concrete or determinate by adding to the marks it contains.
6. n. In old chem., reduction of a liquid to a solid, commonly by partial evaporation.

Wiktionary

1. n. The process of aggregating or coalescing into a mass.
2. n. A solid, hard mass formed by a process of aggregation or coalescence.
3. n. geology A rounded mass of a mineral, sometimes found in sedimentary rock or on the ocean floor.
4. n. The action of making something concrete or the result of such an action.

GNU Webster's 1913

1. n. The process of concreting; the process of uniting or of becoming united, as particles of matter into a mass; solidification.
2. n. A mass or nodule of solid matter formed by growing together, by congelation, condensation, coagulation, induration, etc.; a clot; a lump; a calculus.
3. n. (Geol.) A rounded mass or nodule produced by an aggregation of the material around a center.

WordNet 3.0

1. n. an increase in the density of something
2. n. the formation of stonelike objects within a body organ (e.g., the kidneys)
3. n. the union of diverse things into one body or form or group; the growing together of parts
4. n. a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body