Meaning of balistraria

bal•is•tra•ri•a

Pronunciation: (bal"u-strâr'ē-u), [key]
— pl. -is•tra•ri•ae
  1. (in a medieval fortification) an opening, usually in the form of a cross, through which a crossbow could be fired.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.