Ortho

• List of commonly used taxonomic affixes (ortho-) • Arene substitution patterns, two substituents that occupy adjacent positions on an aromatic ring • Chlordane, an organochlorine compound that was used as a pesticide == Mathematics ==

• Orthogonal, a synonym for perpendicular • Orthonormal, the property that a collection of vectors are mutually perpendicular and each of unit magnitude • Orthodrome, a synonym for great circle, a geodesic on the sphere • Orthographic projection, a parallel projection onto a perpendicular plane == Medicine ==

• Orthomyxovirus, a family of viruses to which influenza belongs • Orthodontics, a specialty of dentistry concerned with the study and treatment of malocclusions • Orthopedic, the study of the musculoskeletal system • Ortho-DOT, a psychedelic drug • Ortho-cept and Ortho Tri-cyclen, kinds of oral contraceptive drug == Theology ==

• Orthodoxy, right (correct) belief • Orthopraxy, right (correct) action == Business ==

• Ortho Pharmaceutical, which merged into Ortho-McNeil Pharmaceutical before being bought by Johnson & Johnson • Ortho-Clinical Diagnostics, a subsidiary of Quidel Corporation • Ortho, a lawn care and pesticide company owned by the Scotts Miracle-Gro Company ==See also==