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

Example Sentences:
'renal calculi can be very painful'

• calculus

3. compaction, compression, concretion, densification

an increase in the density of something

• compaction
• compression
• densification

4. coalescence, coalescency, coalition, concretion, conglutination

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

• coalescence
• coalescency
• coalition
• conglutination