IPA: //ˈsæk.ə.rɪn//
KK: /sæˈkɛrɪn/
A white powder that is much sweeter than regular sugar and is used as a sweetener without calories.
Many people use saccharin as a sugar substitute in their coffee.
Saccharin is derived from the Latin word "saccharum" (meaning sugar) and the suffix "-in" (used to form names of substances). The word refers to a substance that is related to or derived from sugar, specifically an artificial sweetener.
Think of 'saccharum' which means sugar, and remember that saccharin is a substance that mimics the sweetness of sugar.