death zone

== English == === Alternative forms === Death Zone === Etymology === Coined by Swiss physician and alpinist Edouard Wyss-Dunant in 1953 as lethal zone. === Noun === death zone (plural death zones) (climbing) An area of land at sufficiently high altitudes in which there is not enough oxygen to sustain human life. Synonym: lethal zone ==== Translations ==== === See also === === Further reading === death zone on Wikipedia.Wikipedia