a large and inflated capsule  composed of 3–7 united follicles, each containing numerous  seeds . The seed is used as a  spice . http://upload.wikimedia.org/wikipedia/commons/thumb/6/6a/Nigella_Sativa_Seed.jpg/220px-Nigella_Sativa_Seed.jpg In  English ,  Nigella sativa  seed is variously called fennel flower, nutmeg flower, Roman coriander, blackseed or black caraway. Other names used, sometimes misleadingly, are onion seed