名詞 orlop:

1. the fourth or lowest deck
   同義詞：orlop deck, fourth deck

or.lop

n.Nautical （名詞）【航?！?/i>
The lowest deck of a ship, especially a warship, having at least four decks.
最下層甲板：至少有四層甲板船的最下層甲板，特別是軍艦類

來源：
Middle English overlop [floor covering a ship`s hold]
中古英語 overlop [覆蓋般底的甲板]
from Middle Low German overlôp
源自 中古低地德語 overlôp
over [over] * see uper
over [覆蓋] *參見 uper
lôp [a running]
lôp [覆蓋]