definition of
concretion

[1] #1 concretion n. the formation of stonelike objects within a body organ (e.g., the kidneys). wn

[2] #2 concretion n. [calculus] 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". wn

[3] #3 concretion n. [compaction, compression, densification] an increase in the density of something. wn

[4] #4 concretion n. [coalescence, coalescency, coalition, conglutination] the union of diverse things into one body or form or group; the growing together of parts. wn