concretion - noun

the formation of stonelike objects within a body organ (e.g., the kidneys)

a hard lump produced by the concretion of mineral salts; found in hollow organs or ducts of the body

an increase in the density of something

the union of diverse things into one body or form or group; the growing together of parts

concretion - thesaurus

calculus   coalescence   coalescency   coalition   compaction   compression   conglutination   densification