☆ a white, crystalline coal-tar compound, CHNOS, about 500 times sweeter than cane sugar, used as a sugar substitute in diabetic diets, as a noncaloric sweetener, etc.
See saccharin in American Heritage Dictionary 4
(săkˈər-ĭn)
noun
A white crystalline powder, C7H5NO3S, having a taste about 500 times sweeter than cane sugar, used as a calorie-free sweetener.