noun
louver slat; louvre slat
A slat used in a louver (鎧戸), often referring to the individual horizontal or angled slats that make up a louvered door or window.
鎧板が壊れたので、新しいものと交換した。
The louver slat broke, so I replaced it with a new one.
この鎧戸は鎧板が斜めに取り付けられている。
This louvered door has slats installed at an angle.
鎧戸 refers to the entire louvered door or shutter, while 鎧板 refers to the individual slats that make up the louver.
Compound of 鎧 (yoroi, 'armor') and 板 (ita, 'board, plank'), referring to the overlapping, armor-like arrangement of slats in a louver.