- Orthoclase Subst. Adj.
- Orthocomplement Subst.
- Orthocomplementation Subst.
- Orthocoupler Subst. Adj.
- Orthodentin Subst.
- Orthodiagram Subst. Adj.
- Orthodiagraph Subst. Adj.
- Orthodiagraphy Subst.
- Orthodontia Subst.
- Orthodontics Subst.
- Orthodontist Subst.
- Orthodontology Subst.
- Orthodoxy Subst. Eigenn.
- Orthodrome Subst. Adj.
- Orthoepist Subst.
- Orthoepy Subst.
- Orthoferrite Subst. Adj.
- Orthogenesis Subst.
- Orthogeosyncline Subst.
- Orthognathia Subst.
- Orthognathism Subst.
- Orthognathy Subst.
- Orthogonal Adj. Subst.
- Orthogonality Subst.
- Orthogonalization Subst.
- Orthograde Adj. Subst.
- Orthographer Subst.
- Orthography Subst.
- Orthohydrogen Subst. Adj.
- Orthokeratinization Subst.
- Orthokeratology Subst. Adj.
- Orthokeratosis Subst.
- Ortholattice Subst. Adj.
- Orthology Subst. Adj.
- Orthometer Subst. Adj.
- Orthomyxovirus Subst. Adj.
- Orthonormality Subst. Adj.
- Orthonormalization Subst.
- Orthopaedics Subst.
- Orthopaedist Subst.
- Orthopantomogram Subst. Adj.
- Orthopantomograph Subst. Adj.
- Orthopantomography Subst. Adj.
- Orthopedic Adj. Subst.
- Orthopedics Subst.
- Orthopedist Subst.
- Orthophony Subst.
- Orthophoria Subst.
- Orthophosphoric Adj. Subst.
- Orthophotograph Subst. Adj. Verb
- Orthophotomap Subst. Adj.
- Orthophyre Subst.
- Orthopnea Subst.
- Orthopnoea Subst.
- Orthopolar Adj. Subst.
- Orthopole Subst. Adj.
- Orthopositronium Subst.
- Orthopoxvirus Subst. Adj.
- Orthopraxia Subst.
- Orthopraxy Subst.