Cibol \Cib"ol\, n. [F. ciboule, LL. cepula, cepola, dim. of L. cepa, caepa, caepe, an onion. Cf. {Chibbal}, {Cives}.] A perennial alliaceous plant ({Allium fistulosum}), sometimes called Welsh onion. Its fistular leaves areused in cookery. [1913 Webster]