from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or being in the vicinity of the St. Lawrence River.
  • adj. Geology Of or relating to the Precambrian gneissic granite of the Lake Superior area.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Relating to a Precambrian geological region in eastern Canada, or the period of its formation.
  • adj. Relating to the Laurentian Mountains.
  • adj. Pertaining to, or near, the St. Lawrence River.
  • n. An extinct Iroquoian language of Canada.
  • n. The Laurentian period.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Pertaining to, or near, the St. Lawrence River.

from The Century Dictionary and Cyclopedia

  • Of or pertaining to Laurentius or Lorenzo dei Medici, or to the Laurentian Library in Florence, named from him.
  • Of or pertaining to the river St. Lawrence: applied in geology, in 1854, by Sir W. E. Logan, to a series of rocks occupying an extensive area in the region of the Upper Lakes, and previously called by him the metamorphic series, and by Foster and Whitney the azoic series.
  • n. In geology, the Laurentian series.


From Latin Laurentius, Lawrence.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin Laurentius ("Laurence") + -ian, after the St. Lawrence River. (Wiktionary)



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