n. the scientific study, or a physical description of mountains
n. the orographic features of a region
the GNU version of the Collaborative International Dictionary of English
n. That branch of science which treats of mountains and mountain systems; orology.
The Century Dictionary and Cyclopedia
n. That division of physical geography or physiography which has to do with the relations and development of the mountain-chains of the regions described.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the science of mountains
Word Usage
"It has a very complex orography whose determinants include a mountainous surface full of cliffs, ridges, hillsides and valleys, with a steep and highly dissected topography."