orlop

n. 最下层甲板

or.lop

n.Nautical （名词）【航海】
The lowest deck of a ship, especially a warship, having at least four decks.
最下层甲板：至少有四层甲板船的最下层甲板，特别是军舰类

来源：
Middle English overlop [floor covering a ship`s hold]
中古英语 overlop [覆盖般底的甲板]
from Middle Low German overlôp
源自 中古低地德语 overlôp
over [over] * see uper
over [覆盖] *参见 uper
lôp [a running]
lôp [覆盖]