the Mesozoic landmass in the Northern Hemisphere that included what are now North America and Eurasia: it and Gondwana were the result of the splitting of Pangea
See Laurasia in American Heritage Dictionary 4
(lô-rāˈzhə, -shə)
noun
The protocontinent of the Northern Hemisphere, a hypothetical landmass that according to the theory of plate tectonics broke up into North America, Europe, and Asia.