Fennel seed, the dried ripe fruit of cultivated varieties of Foeniculum vulgare (family Umbelliferae), an herb native to southern Europe and Asia, a diaphoretic and carminative; a volatile oil distilled from the fruit is used as a flavoring.
[through O. Fr., fr. L. faeniculum, fennel, dim. of faenum, hay]
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Examples: glitazone, GI cocktail, etc.