tundra Syllabification: (tun·dra)Pronunciation: /ˈtəndrə/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. Origin: late 16th century: from Lappishtundra in other Oxford dictionaries Definition of tundra in the British & World English dictionary