cor·dil·le·ran 
(kôr′dl-yârən, kôr-dĭlər-ən)
(kôr′dl-yârən, kôr-dĭlər-ən)adj.
1. Of or relating to a cordillera.
2. Cordilleran Of or relating to an ice sheet that covered most of northwestern North America west of the Rocky Mountains during the Pleistocene Epoch and that melted between 15,000 and 10,000 years ago.