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