nappe

詳細解釋：

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.
【地質學】 移動的岩石：被移於遠離原先位置的巨大層狀岩石
Mathematics Either of the two parts into which a cone is divided by the vertex.
【數學】 錐頂片：位於錐頂兩邊而形成一個錐體的兩片中的一片

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