concretion in WordNet English dictionary

1. 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"
   calculus  concretion 
   
2. the union of diverse things into one body or form or group; the growing together of parts
   coalescence  coalescency  coalition  concretion  conglutination 
   
3. an increase in the density of something
   compaction  compression  concretion  densification 
   
4. the formation of stonelike objects within a body organ (e.g., the kidneys)
   concretion