tundra(redirected from tundras)
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1. A treeless area beyond the timberline in high-latitude regions, having a permanently frozen subsoil and supporting low-growing vegetation such as lichens, mosses, and shrubs.
2. A similar area found at high elevations.
[Russian, from Sami tūndar, flat-topped hill.]
a. a vast treeless zone lying between the ice cap and the timberline of North America and Eurasia and having a permanently frozen subsoil
b. (as modifier): tundra vegetation.
[C19: from Russian, from Lapp tundar hill; related to Finnish tunturi treeless hill]
tun•dra(ˈtʌn drə, ˈtʊn-)
n., pl. -dras.
any of the vast, nearly level, treeless plains of the arctic regions of Europe, Asia, and North America.
[1835–45; < Russian < Lappish, a Finnic language spoken by the Lapps; compare Kola Lappish tūndar flat elevated area]
A cold, treeless, usually lowland area of far northern regions. The subsoil of tundras is permanently frozen, but in summer the top layer of soil thaws and can support low-growing mosses, lichens, grasses, and small shrubs.
An area between the tree line in Arctic regions and the polar ice, with low-growing vegetation and permanently frozen subsoil.