Etymology
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Laurasia

Paleozoic supercontinent comprising North America and Eurasia, 1931, from German (1928), from Laurentia, geologists' name for the ancient core of North America (see Laurentian) + second element of Eurasia.

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Definitions of Laurasia

Laurasia (n.)
a hypothetical continent that (according to plate tectonic theory) broke up later into North America and Europe and Asia;
From wordnet.princeton.edu