tundraPronunciation: /ˈtʌndrə/Translate tundra | into Spanish Definition of tundra noun a vast, flat, treeless Arctic region of Europe, Asia, and North America in which the subsoil is permanently frozen: [as modifier]:tundra vegetationOrigin: late 16th century: from Lappishtundra in other Oxford dictionaries Definition of tundra in the US English dictionary