Collier's New Encyclopedia (1921)/Ballistraria
BALLISTRARIA, one of the names given to those projections with narrow apertures, frequent in the walls of old castles, and through which the crossbowmen discharged their arrows.
BALLISTRARIA, one of the names given to those projections with narrow apertures, frequent in the walls of old castles, and through which the crossbowmen discharged their arrows.