- Orthograde Adj. Subst.
- Orthographer Subst.
- Orthographic Adj.
- Orthographical Adj.
- Orthographically Adv.
- Orthography Subst.
- Orthohydrogen Subst. Adj.
- Orthokeratinization Subst.
- Orthokeratology Subst. Adj.
- Orthokeratosis Subst.
- Ortholattice Subst. Adj.
- Orthology Subst. Adj.
- Orthometer Subst. Adj.
- Orthometric Adj.
- Orthomodular Adj.
- Orthomorphic Adj.
- Orthomyxovirus Subst. Adj.
- Orthonormal Adj.
- Orthonormality Subst. Adj.
- Orthonormalization Subst.
- Orthonormalize Verb
- Orthonormalized Adj. Part. Perf.
- Orthooptic Adj.
- Orthooptical Adj.
- Orthopaedic Adj.
- Orthopaedics Subst.
- Orthopaedist Subst.
- Orthopantomogram Subst. Adj.
- Orthopantomograph Subst. Adj.
- Orthopantomography Subst. Adj.
- Orthopedic Adj. Subst.
- Orthopedical Adj.
- Orthopedically Adv.
- Orthopedics Subst.
- Orthopedist Subst.
- Orthophony Subst.
- Orthophoria Subst.
- Orthophosphoric Adj. Subst.
- Orthophotograph Subst. Adj. Verb
- Orthophotomap Subst. Adj.
- Orthophyre Subst.
- Orthopnea Subst.
- Orthopneic Adj.
- Orthopnoea Subst.
- Orthopnoeic Adj.
- Orthopolar Adj. Subst.
- Orthopole Subst. Adj.
- Orthopositronium Subst.
- Orthopoxvirus Subst. Adj.
- Orthopraxia Subst.
- Orthopraxy Subst.
- Orthoprojector Subst. Adj.
- Orthopsychiatric Adj.
- Orthopsychiatrical Adj.
- Orthopsychiatrist Subst.
- Orthopsychiatry Subst.
- Orthopter Subst.
- Orthopteran Subst. Adj.
- Orthopterous Adj.
- Orthoptic Adj.