Pronunciation: (ma-sēf', mas'if; Fr. ma-sēf'), [key]
1. a compact portion of a mountain range, containing one or more summits.
2. a large elevated block of old complex rocks resistant to both erosion and crustal folding.
3. a band or zone of the earth's crust raised or depressed as a unit and bounded by faults.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.