nappe(redirected from Recumbent fold)
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1. A sheet of water flowing over a dam or similar structure.
2. Geology A large sheetlike body of rock that has been moved far from its original position.
3. Mathematics Either of the two parts into which a cone is divided by the vertex.
[French, tablecloth, nappe, from Old French, tablecloth, from Latin mappa, napkin; see map.]
1. (Geological Science) a large sheet or mass of rock, commonly a recumbent fold, that has been thrust from its original position by earth movements
2. the sheet of water that flows over a dam or weir
3. (Mathematics) geometry either of the two parts into which a cone (sense 2) is divided by the vertex
[C20: from French: tablecloth]
Geom. one of the two equal sections of a cone.
[1905–10; < French: literally, tablecloth; Old French nappe, nape < Latin mappa]
A recumbent (flopped over) fold that has sheared through, with its upper limb forced far forward.