Laurentian

[law-ren-shuh n]
adjective
  1. of or relating 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 of Laurentian

1860–65; < Late Latin Laurenti(us) Lawrence (orig. adj., equivalent to Laurent(ēs) men of Laurentum + -ius -ious) + -an

Laurentian Mountains

plural noun
  1. a range of low mountains in E Canada, between the St. Lawrence River and Hudson Bay.
Also called Lau·ren·tians.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for laurentian

Laurentian

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

Laurentian Mountains

pl n
  1. a range of low mountains in E Canada, in Quebec between the St Lawrence River and Hudson Bay. Highest point: 1191 m (3905 ft)Also called: Laurentides (ˈlɔːrənˌtaɪdz)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for laurentian

Laurentian

in reference to 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 North America and Eurasia, 1931, from German (1928), from Laurentia, geologists' name for the ancient core of North America + (Eur)asia.

Online Etymology Dictionary, © 2010 Douglas Harper