IPA: /kənˈkriːʃən/
KK: /kənˈkriːʃən/
A solid, hard mass formed by the gathering of mineral matter or other materials, often found in geological contexts or as a mass in the body.
The geologist discovered a concretion embedded in the sedimentary rock during the excavation.
Concretion is formed from "con-" (meaning together) and "cretio" (from Latin "creare", meaning to create or grow). The word describes the process of materials coming together to form a solid mass or substance.
Think of materials 'growing together' ('con-') to form a solid mass, which is what concretion means.