Acute Gastric Catarrh. Synonyms:—Acute gastritis; acute catarrhal gastritis; gastric catarrh; acute dyspepsia. Acute Toxic Gastritis. Definition:—A violent, acute inflammation of the stomach, induced by powerful irritants and corrosives. Phlegmonous Gastritis. Synonym:—Acute suppurative gastritis. Chronic Gastritis. Synonyms:—Chronic catarrhal gastritis; chronic gastric catarrh; chronic catarrh of the stomach; chronic dyspepsia; chronic catarrhal dyspepsia.