orni - pale
- ornithology
- orocline
- orogen
- orogenesis
- orogenetic
- orogenetic movements
- orogenic
- orogenic belt
- orogenic cycle
- orogenic hydrothermal deposit
- orogenic phase
- orogenic zone
- orogeny
- ort
- orthite
- orthoaxis
- orthochronology
- orthoclase
- orthoclasite
- orthoclastization
- orthoconglomerate
- orthocumulate
- orthodiadochite
- orthodiagonal axis
- orthodolomite
- orthodome
- orthoevolution
- orthofelsite
- orthogenesis
- orthogeosynclinal system
- orthogeosyncline
- orthogneiss
- orthogonality
- orthographic projection
- ortholimestone
- orthomagmatic deposit
- orthomagmatic stage
- orthometamorphism
- orthometamorphite
- orthomigmatite
