Meaning of orogen

or•o•gen

Pronunciation: (ôr'u-jen", -jun, ōr'-), [key]
— n. Geol.
  1. an extensive belt of rocks deformed by orogeny, associated in places with plutonic and metamorphic rocks.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.