Definition of nagelfluh in US English:

nagelfluh

noun

Geology
  • A massive conglomerate of Miocene age which is associated with the molasse of the Swiss Alps and contains pebbles likened to nail heads.

Origin

Early 19th century; earliest use found in Robert Jameson (1774–1854), geologist and natural historian. From German Nagelfluh, originally a German regional (Swiss) compound from Nagel + Fluh bare rock, rock face.

Pronunciation

nagelfluh

/ˈnɑːɡ(ə)lfluː/