Noun
(geology) The rock deformed by an orogeny
A mountain pass.
Source: en.wiktionary.orgThe orogeny of an orogen is only part of the orogen's orogenic cycle. Source: Internet
The foreland basin forms ahead of the orogen due mainly to loading and resulting flexure of the lithosphere by the developing mountain belt. Source: Internet
What exactly happens in a specific orogen depends upon the strength and rheology of the continental lithosphere, and how these properties change during orogenesis. Source: Internet