/law ren"sheuhn/ , adj.
1. of or pertaining to the St. Lawrence River.
2. Geol. noting or pertaining to the granite intrusions and orogeny in Canada around the Great Lakes during Archeozoic time.
[ 1860-65; Laurenti ( us ) Lawrence (orig. adj., equiv. to Laurent ( es ) men of Laurentum + -ius -IOUS) + -AN ]