シメチジンMeanings1nouncimetidineA histamine H2 receptor antagonist used to treat peptic ulcers and gastroesophageal reflux disease. Medical term.医い師しは胃い潰かい瘍ようの治ち療りょうにシメチジンを処しょ方ほうした。The doctor prescribed cimetidine for the treatment of the gastric ulcer.