- Orthomodular Adj
- Orthomorphic Adj
- Orthomyxovirus Noun
- Orthonormal Adj
- Orthonormality Noun
- Orthonormalization Noun
- Orthonormalize Verb
- Orthonormalized Adj
- Orthooptic Adj
- Orthooptical Adj
- Orthopaedic Adj
- Orthopaedics Noun
- Orthopaedist Noun
- Orthopantomogram Noun
- Orthopantomograph Noun
- Orthopantomography Noun
- Orthopedic Adj
- Orthopedical Adj
- Orthopedically Adv
- Orthopedics Noun
- Orthopedist Noun
- Orthophony Noun
- Orthophoria Noun
- Orthophosphoric Adj
- Orthophotograph Noun
- Orthophotomap Noun
- Orthophyre Noun
- Orthopnea Noun
- Orthopneic Adj
- Orthopnoea Noun
- Orthopnoeic Adj
- Orthopolar Adj
- Orthopole Noun
- Orthopositronium Noun
- Orthopoxvirus Noun
- Orthopraxia Noun
- Orthopraxy Noun
- Orthoprojector Noun
- Orthopsychiatric Adj
- Orthopsychiatrical Adj
- Orthopsychiatrist Noun
- Orthopsychiatry Noun
- Orthopter Noun
- Orthopteran Noun
- Orthopterous Adj
- Orthoptic Adj
- Orthoptics Noun
- Orthoptist Noun
- Orthopyroxen Noun
- Orthopyroxene Noun
- Orthorhombic Adj
- Orthoroentgenography Noun
- Orthoroentgenometry Noun
- Orthorombic Adj
- Orthoscanner Noun
- Orthoscheme Noun
- Orthoscope Noun
- Orthoscopic Adj
- Orthosilicate Noun
- Orthosis Noun