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Laurentian

[law-ren-shuh n] /lɔˈrɛn ʃən/
adjective
1.
of or pertaining to the St. Lawrence River.
2.
Geology. noting or pertaining to the granite intrusions and orogeny in Canada around the Great Lakes during Archeozoic time.
Origin
1860-1865
1860-65; < Late Latin Laurenti(us) Lawrence (orig. adj., equivalent to Laurent(ēs) men of Laurentum + -ius -ious) + -an
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for Laurentian

Laurentian

/lɔːˈrɛnʃən/
adjective
1.
Also Lawrentian. of or resembling the style of D. H. Lawrence or T. E. Lawrence
2.
of, relating to, or situated near the St Lawrence River
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for Laurentian
Laurentian
"granite strata in eastern Canada," 1863, named for the Laurentian Mountains, where it is found, which are named for the nearby St. Lawrence River. Hence, Laurasia, Paleozoic supercontinent comprising N.America and Eurasia, 1931, from Ger. (1928), from Laurentia, geologists' name for the ancient core of N.America + (Eur)asia.
Online Etymology Dictionary, © 2010 Douglas Harper
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