Normalnull

== German == === Alternative forms === Normal-Null === Etymology === From normal (“normal”) +‎ Null (“zero”). === Pronunciation === IPA(key): /nɔrˈmaːlnʊl/ === Noun === Normalnull n (strong, genitive Normalnulls, no plural) (oceanography) The mean altitude of sea level; mean sea level. Synonyms: NN, Meeresspiegel 1343 Meter über Normalnull ― 1,343 meters above mean sea level. ==== Usage notes ==== Used as a geodesic reference point for geographical altitude in Germany from 1879–1992, replaced by Normalhöhennull (NHN) in 1993. ==== Declension ==== === Further reading === “Normalnull” in Duden online “Normalnull” in Digitales Wörterbuch der deutschen Sprache Normalnull on the German Wikipedia.Wikipedia de