"concretion" in the noun sense
1. concretion
the formation of stonelike objects within a body organ (e.g., the kidneys)
2. calculus, concretion
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"
3. compaction, compression, concretion, densification
an increase in the density of something
4. coalescence, coalescency, coalition, concretion, conglutination
the union of diverse things into one body or form or group the growing together of parts
Source: WordNet® (An amazing lexical database of English)
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