Origin: 1250–1300; ME barbecan, barbican < OF barbacane or ML barbacana, perh. ≪ Pers bālāḥāna terrace over a roof, upper floor, altered by assoc. with L barbabeard, a beard marking the front or face of a thing
"outer fortification of a city or castle," 1300, from O.Fr. barbacane (12c.), a general Romanic word, perhaps from Arabic or Pers. (cf. bab-khanah "gate-house").