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Background: Cuminum cyminum Linn. (Umbelliferae), commonly known as Jeera. It is native from mediterranean region, but today widely cultivated in Asian countries. It has been reported to possess various medicinal properties and an important food ingredient. The seed of the plant are claimed for treatment of diarrhoea by various traditional practitioners. Objectives: Hence, the present investigation was undertaken to evaluate aq. extract of C. cyminum seeds (ACCS) against diarrhoea on albino rats. Materials and Methods: The animals were divided into five groups and the control group was applied with 2% acacia suspension, the standard group with loperamide (3 mg/kg) or atropine sulphate (5mg/kg) and three test groups administered orally with 100, 250 and 500 mg/kg of ACCS. The antidiarrhoeal effect was investigated by castor oil induce diarrhoea model, prostaglandin E2 (PGE2) induced enteropooling model, intestinal transit by charcoal meal test. Results: The ACCS showed significant (P < 0.001) inhibition in frequency of diarrhoea, defecation time delaying, secretion of intestinal fluid as well as intestinal propulsion as compared to control and the graded doses of tested extract followed dose dependent protection against diarrhoea. Conclusions: The study reveals that the ACCS is a potent antidiarrhoeal drug which supports the traditional claim. [ABSTRACT FROM AUTHOR]