Dictionary![]() ![]() bal•is•tra•ri•aPronunciation: (bal"u-strâr'ē-u), [key] —n., —pl. -is•tra•ri•aePronunciation: (-u-strâr'ē-ē"). [key] (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.
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