Laurentian
Pronunciation : Lau*ren"tian
Part of Speech : a.
Definition : Defn: Pertaining to, or near, the St. Lawrence River; as, the Laurentian hills. Laurentian period (Geol.), the lower of the two divisions of the Arch?an age; -- called also the Laurentian.
Source : Webster's Unabridged Dictionary, 1913