The Collaborative International Dictionary of English v.0.48:
Gastritis \Gas*tri"tis\, n. [NL., from. Gr. ?, ?, stomach + -itis.] (Med.) Inflammation of the stomach, esp. of its mucuos membrane. [1913 Webster]WordNet (r) 3.0 (2006):
gastritis n 1: inflammation of the lining of the stomach; nausea and loss of appetite and discomfort after eating