‖ balistrariaArch.|bælɪˈstrɛərɪə| [med.L., properly fem. of adj.ballistrārius.; see next.] a. A cruciform aperture in the walls of a fortress, through which arbalesters discharged their weapons. b. A room in which arbalests were kept. 1845in Gloss. Gothic Archit. I. 38.