Lau·ren·tian 
(lô-rĕnshən)
(lô-rĕnshən)adj.
1. Of, relating to, or being in the vicinity of the St. Lawrence River.
2. Geology Of or relating to the Precambrian gneissic granite of the Lake Superior area.
[From Latin Laurentius, Lawrence.]
- imprecisely
- imprecision
- impregnable
- impregnable
- impregnably
- impregnate
- impregnation
- impregnator
- impresa
- impresario
- impress
- impress
- impressibility
- impressible
- impressibly
- impression
- impressionability
- impressionable
- impressionism
- impressionist
- impressionistic
- impressionistically
- impressive
- impressively
- impressiveness