/ Dictionary / Index L Laurentian: Meaning and Definition of Find definitions for: Lau•ren•tian Pronunciation: (lô-ren'shun), [key] — adj. of or pertaining to the St. Lawrence River. noting or pertaining to the granite intrusions and orogeny in Canada around the Great Lakes during Archeozoic time. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Laurens Laurentian Mountains Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language