nappe

n.（名詞）
A sheet of water flowing over a dam or similar structure.
水幕：從壩頂或類似的構(gòu)造物落下一層水
Geology A large sheetlike body of rock that has been moved far from its original position.
【地質(zhì)學(xué)】 移動的巖石：被移于遠離原先位置的巨大層狀巖石
Mathematics Either of the two parts into which a cone is divided by the vertex.
【數(shù)學(xué)】 錐頂片：位于錐頂兩邊而形成一個錐體的兩片中的一片

來源：
French [tablecloth, nappe]
法語 [桌布，簾]
from Old French [tablecloth]
源自 古法語 [桌布]
from Latin mappa [napkin] * see map
源自 拉丁語 mappa [餐巾] *參見 map