oro-, oreo-, ore-, oreino-, orein-

(Greek > Latin: mountain; hill)

bathyorographical (adjective), more bathyorographical, most bathyorographical
A reference to underwater depth and the elevation or heights above sea level including mountains.
bathyorography (s) (noun), bathyorographies (pl)
The study and mapping of variations in the earth's surface, including depths of bodies of water (oceans, lakes, etc.) and the mountains and the mountain ranges.
Oread
In Greek mythology, one of the mountain nymphs.
Oreodon
A genus of extinct herbivorous mammals, abundant in the Tertiary formation of the Rocky Mountains. It is more or less related to the camel, hog, and deer.
Oreodont
Resembling, or allied to, the genus Oreodon.

Oredon refers to a genus of extinct herbivorous mammals, abundant in the Tertiary formation of the Rocky Mountains. It is more or less related to the camel, hog, and deer.

oreography
The science of mountains; orography.
oreosoma
A genus of small oceanic fishes, remarkable for the large conical tubercles which cover the under surface.
orobathymetric
1. Referring to a map showing sea depths or submerged heights (like underwater "mountains").
2. A map showing submerged mountain-type heights and sea depths
orocratic
1. Literally, the "strength" and "power" of mountains.
2. Pertaining to a period of time in which there is much diastrophism; or, the process of deformation by which the major features of the earth's crust, including continents, mountains, ocean beds, folds, and faults, are formed.
orogen
An intensely deformed crustal belt associated with mountain building.
orogenesis
The folding, faulting, and uplift of the earth's crust to form mountain ranges; often accompanied by volcanic and seismic activity.
orogenetic
A reference to the process of mountain formations; especially, by the folding of the areas of the earth's crust.
orogenic
A reference to the process of mountain formation, especially by a folding and faulting of the earth's crust.
orogenic belt
A linear region that has undergone folding or other deformation during the orogenic cycle. Also known as fold belt; orogen; orogene.
orogeny
The process of mountain building or formation; especially, by folding and faulting of the earth's crust and by plastic folding, metamorphism, and the intrusion of magmas in the lower parts of the lithosphere.

Unlike epeirogeny, orogeny usually affects smaller regions and is associated with evidence of folding and faulting.

The long chains of mountains often seen on the edges of continents form through orogeny.

As traditionally used, the term orogeny refers to the development of long, mountainous belts on the continents that are called orogenic belts or orogens.

  • These include the Appalachian and Cordilleran orogens of North America, the Andean orogen of western South America, the Caledonian orogen of northern Europe and eastern Greenland, and the Alpine-Himalayan orogen that stretches from western Europe to eastern China.
  • It is important to recognize that these systems represent only the most recent orogenic belts that retain the high relief characteristic of mountainous regions.
  • In fact, the continents can be viewed as a collage of ancient orogenic belts, most of which are so deeply eroded that no trace of their original mountainous topography remains.
  • By comparing characteristic rock assemblages from more recent orogens with their deeply eroded counterparts, geologists surmise that the processes responsible for mountain building today extended back through most (if not all) of geologic time and played a major role in the growth of the continents.
  • The construction of mountain belts is best understood in the context of plate tectonics theory.
  • Orogenic belts form at convergent boundaries, where lithosphere plates collide.
  • There are two basic kinds of convergent plate boundaries, leading to the development of two end-member classes of orogenic belts.
  • Oceanic subduction boundaries are those at which oceanic lithosphere is thrust (subducted) beneath either continental or oceanic lithosphere.
  • The process of subduction leads to partial melting near the plate boundary at depth, which is manifested by volcanic and intrusive igneous activity in the overriding plate.
  • Where the overriding plate consists of oceanic lithosphere, the result is an intraoceanic island arc; such as, the Japanese islands.
  • Where the overriding plate is continental, a continental arc is formed. The Andes of western South America is an example.
—Excerpts from Science and Technology Ecnyclopedia;
McGraw Hill Education.

Pointing to mountain words. More "mountain" words at this mont-, mount- unit.