[ bal-uh-strair-ee-uh ]
/ ˌbæl əˈstrɛər i ə /

noun, plural bal·is·tra·ri·ae [bal-uh-strair-ee-ee] /ˌbæl əˈstrɛər iˌi/.

(in a medieval fortification) an opening, usually in the form of a cross, through which a crossbow could be fired.

Origin of balistraria

1835–45; < Medieval Latin, feminine of Late Latin bal(l)istrārius, Latin ballistārius pertaining to a ballista (in ML a crossbow), equivalent to ballist(a) + -ārius -ary Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019