Lau‐ren″tian (?), a. Pertaining to, or near, the St. Lawrence River; as, the Laurentian hills.
Laurentian period(Geol.), the lower of the two divisions of the Archæan age; — called also the Laurentian.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.