tai·ga (t??g?)n. A subarctic area of northern Eurasia and North America located just south of the tundra and covered largely with coniferous forests dominated by firs and spruces.[Russian ta?ga, from a Turkic source such as Tuvan tayga or Yakut tay?a.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.taiga (?ta???) n (Physical Geography) the coniferous forests extending across much of subarctic North America and Eurasia, bordered by tundra to the north and steppe to the south[from Russian, of Turkic origin; compare Turkish da? mountain]Collins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014tai?ga (?ta? g?, ta??g?) n., pl. -gas. any of the coniferous evergreen forests of subarctic lands, covering vast areas of N North America and Eurasia. [1885?90;