名詞 deadlight:

1. a strong shutter over a ship's porthole that is closed in stormy weather

dead.light

n.（名詞）
Nautical
【航?！?/i>
A strong shutter or plate fastened over a ship`s porthole or cabin window in stormy weather.
舷窗內蓋：一種堅固的百葉窗或厚金屬板，系在船的舷窗上或船窗玻璃上，用在暴風雨的天氣中
A thick window set in a ship`s side or deck.
固定舷窗：安裝在船側或甲板上的厚窗戶
A skylight constructed so that it cannot be opened.
固定天窗：這樣建造的天窗使它不能被打開