Canadian Shield: Meaning and Definition of

Cana'dian Shield'

Pronunciation: [key]
— Geol. Geol.
  1. the extensive region making up much of northern and central Canada underlain by Precambrian rocks that have been eroded to produce a low shieldlike profile.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.