stevia /ˈstiːvɪə/ noun2 •Any of the sweet herbs of genus Stevia, native to tropical and subtropical regions of South America and western North America.My absolute preference for a sweetener is the herb stevia—not the white crystalline extract, but the chopped green leaves. Stevia has no calories and does not cause any insulin response. — 2010 •A sweetener, many times sweeter than an equal amount of sugar, extracted from Stevia rebaudiana, that can be substituted for sugar for some purposes.Stevia is a natural, non-fattening sweetener that is 30 to 100 times sweeter than sugar and without any of the aftertaste that is common in many sugar substitutes. — 2003 formsstevias