Fennel Seed Fennel seed is the spice produced from the fruit of the Foeniculum vulgare, a perennial herb in the parsley family (Apiaceae). Learn more about fennel seed here. Synonyms: fennel seedsRelated Articles: What Can Spices and Herbs Do?How Did Spices Go Global?FenugreekCarawayStar AniseMahlabCorianderCuminAniseFennel Seed« Back to Glossary Index