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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