Laurentian Definition
lô-rĕnshən
adjective
Of or relating to the St. Lawrence River.
Webster's New World
Of or relating to the Precambrian gneissic granite of the Lake Superior area.
American Heritage
Designating or of a series of rocks of the Precambrian system in E Canada.
Webster's New World
Origin of Laurentian
From Latin Laurentius Lawrence
From American Heritage Dictionary of the English Language, 5th Edition
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