concretion
noun.
the formation of stonelike objects within a body organ (e.g., the kidneys)
noun.
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
Synonym: calculus
noun.
an increase in the density of something
noun.
the union of diverse things into one body or form or group; the growing together of parts