Ortho-
//ɔː.θə-//
Word Type
Prefix
The word "ortho-" can be used as a prefix.
Word Relationships
Derived Terms
anorthoclase anorthominasragrite orthoacetate orthoacid orthoaluminate orthoamphibolite orthoarsenite orthobenzoate orthobenzoquinone orthobicupola orthobiologic orthoborate orthocarbonate orthocclusion orthocenter orthocentral orthocentric orthocephalic orthoceratite orthocharmonium orthochess orthochoanitic orthochromatic orthochronous orthochrysotile orthoclase orthoclastic orthocleavage orthocomplement orthoconglomerate orthoconic orthocousin orthocumulate orthodata orthodentin orthodiagonal orthodome orthodontics orthodrome orthodromic orthoester orthoevolution orthoexciton orthofacial orthoferrite orthofluvial orthoformate orthogamous orthogamy orthogenesis orthogenic orthogeosyncline orthogeriatric orthogeriatrics orthognathous orthogneiss orthogon orthogonal orthograde orthograft orthographic orthographical orthography orthogravitropism orthogrid orthogroup orthohedron orthohelium orthohexagonal orthohydrogen orthokeratology ortholinear orthology orthomegodont orthometric orthometry orthomode orthomodular orthomolecular orthomyxovirus orthonasal orthonitrate orthonitric acid orthonormalization orthonym orthopair orthopalinal orthopathy orthopedagogy orthopedia orthoperiodate orthoperiodic orthophemistic orthophenylene orthophony orthophosphate orthophosphite orthophosphoric orthophosphoric acid orthophoto orthophotography orthophthalic orthopia orthopinacoid orthopinakiolite orthoploid orthopnoea orthopositronium orthoprax orthopsychiatry orthopsychology orthoptics orthopyroxene orthoquarkonium orthoquartzite orthoquinone orthoradial orthorectification orthorectify orthorexia orthorhombic orthoroentgenography orthoscopic orthoscopy orthoselection orthoselective orthosexual orthosexuality orthosilicate orthoslice orthosomatic orthosomnia orthostasis orthostereoscopic orthostereoscopy orthosteric orthostyle orthosubstitution orthosurgeon orthosurgery orthosymmetric orthosympathetic orthotaxon orthotone orthotope orthotropic pseudoorthorhombic
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.