diuretic /daɪ(j)əˈɹɛtɪk/adjective 1noun 1forms 3 adjective1 •Increasing the amount or frequency of urination.Blackcurrant leaf has a diuretic action [11,12,14], therefore it should not be taken concurrently with diuretics indicated for cardiac or renal insufficiency except on medical advice. — 2003 noun1 •A drug or a substance that increases the rate of urine excretion.Blackcurrant leaf has a diuretic action [11,12,14], therefore it should not be taken concurrently with diuretics indicated for cardiac or renal insufficiency except on medical advice. — 2003 formsdiuretics · more diuretic · most diuretic