IPA: /ɡæˈstraɪtɪs/
KK: /gæˈstraɪtɪs/
A condition characterized by inflammation of the stomach lining, which can be either chronic or acute.
The doctor diagnosed her with gastritis after she complained of stomach pain.
Gastritis is formed from "gastro-" (from Greek "gaster", meaning stomach) and "-itis" (from Greek "itis", meaning inflammation). The word refers to the inflammation of the stomach.
Think of 'gastro-' relating to the stomach and '-itis' indicating inflammation, so gastritis means inflammation of the stomach.