The Collaborative International Dictionary of English v.0.48:

Bartizan \Bar"ti*zan`\, n. [Cf. Brettice.] (Arch.)
   A small, overhanging structure for lookout or defense,
   usually projecting at an angle of a building or near an
   entrance gateway.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

56 Moby Thesaurus words for "bartizan":
   abatis, advanced work, balistraria, bank, banquette,
   barbed-wire entanglement, barbican, barricade, barrier, bastion,
   battlement, breastwork, bulwark, casemate, cheval-de-frise,
   circumvallation, contravallation, counterscarp, curtain,
   demibastion, dike, drawbridge, earthwork, enclosure, entanglement,
   escarp, escarpment, fence, fieldwork, fortalice, fortification,
   glacis, loophole, lunette, machicolation, mantelet, merlon, mound,
   outwork, palisade, parados, parapet, portcullis, postern gate,
   rampart, ravelin, redan, redoubt, sally port, scarp, sconce,
   stockade, tenaille, vallation, vallum, work