- of or relating to the St. Lawrence River
- designating or of a series of rocks of the Precambrian system in E Canada
Origin of Laurentianfrom Classical Latin laurentius, Lawrence + -an
- Of, relating to, or being in the vicinity of the St. Lawrence River.
- Geology Of or relating to the Precambrian gneissic granite of the Lake Superior area.
Origin of LaurentianFrom Latin Laurentius Lawrence