Definitions

1. noun

A hard, compact mass of mineral matter formed naturally around a core or nucleus, especially in a rock or soil.

“The geologist studied the concretion that had formed around the ancient fossil.”

2. noun

A hardened mass of material, such as a deposit, in an organ or tissue, especially in the kidneys, formed as a result of disease or injury.

“The doctor examined the patient’s concretion and ordered further tests to determine the cause.”