形容詞 inboard:

1. located within the hull or nearest the midline of a vessel or aircraft

in.board

adj.Abbr. inbd.（形容詞）縮寫 inbd.
Nautical Within the hull or toward the center of a vessel.
【航海】 船內的：在艙內的或朝著船中部的
Relatively close to the fuselage of an aircraft:
內側的：離飛機機身相對較近的：
例句：
the inboard engines.
機側引擎

n.Nautical （名詞）【航?！?/i>
A motor attached to the inside of the hull of a boat.
艙內的馬達：安裝在船體內側的馬達

【引伸】
in.board.
adv.（副詞）