cren·el·a·tion /ˌkrɛnḷˈeʃən/
鎗眼設備
Cren·el·a·tion n. The act of crenelating, or the state of being crenelated; an indentation or an embrasure. [Written also crenellation.]
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crenelation
n 1: a rampart built around the top of a castle with regular gaps
for firing arrows or guns [syn: battlement, crenellation]
2: the action of constructing rampparts with gaps for firing
guns or arrows [syn: crenellation]