Ortho- is a Greek prefix meaning “straight”, “upright”, “right” or “correct”. Ortho may refer to: * Ortho, Belgium, a village in the Belgian province of Luxembourg In science * arene substitution patterns, two substituents that occupy adjacent positions on an aromatic ring * Chlordane, an organochlorine compound that was used as a pesticide In mathematics: *

Orthogonal In mathematics, orthogonality is the generalization of the geometric notion of ''perpendicularity''. By extension, orthogonality is also used to refer to the separation of specific features of a system. The term also has specialized meanings in ...

, 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 In mathematics, a great circle or orthodrome is the circular intersection of a sphere and a plane passing through the sphere's center point. Any arc of a great circle is a geodesic of the sphere, so that great circles in spherical geomet ...

, a geodesic on the sphere *

Orthographic projection Orthographic projection (also orthogonal projection and analemma) is a means of representing Three-dimensional space, three-dimensional objects in Two-dimensional space, two dimensions. Orthographic projection is a form of parallel projection in ...

, a parallel projection onto a perpendicular plane In medicine: * Orthomyxovirus, a family of viruses to which influenza belongs *

Orthodontics Orthodontics is a dentistry specialty that addresses the diagnosis, prevention, management, and correction of mal-positioned teeth and jaws, and misaligned bite patterns. It may also address the modification of facial growth, known as dentofacial ...

, 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 Desogestrel/ethinylestradiol (EE/DSG), sold under the brand name Marvelon among others, is a fixed-dose combination of desogestrel (DSG), a progestin, and ethinylestradiol (EE), an estrogen, which is used as a birth control pill to prevent pregn ...

and Ortho Tri-cyclen, kinds of oral contraceptive drug In theology: *

Orthodoxy Orthodoxy (from Greek: ) is adherence to correct or accepted creeds, especially in religion. Orthodoxy within Christianity refers to acceptance of the doctrines defined by various creeds and ecumenical councils in Antiquity, but different Churc ...

, right (correct) belief * Orthopraxy, right (correct) action In business: * Ortho Pharmaceutical, which merged into Ortho-McNeil Pharmaceutical before being bought by Johnson & Johnson *

Ortho-Clinical Diagnostics Ortho Clinical Diagnostics is an in vitro diagnostics company that makes products and diagnostic equipment for blood testing. Ortho serves two primary industries in the medical field: clinical laboratories, by producing platforms and assays that ...

, another subsidiary of Johnson & Johnson * Ortho, a

lawn care A lawn is an area of soil-covered land planted with grasses and other durable plants such as clover which are maintained at a short height with a lawnmower (or sometimes grazing animals) and used for aesthetic and recreational purposes. L ...

and

pesticide Pesticides are substances that are meant to control pests. This includes herbicide, insecticide, nematicide, molluscicide, piscicide, avicide, rodenticide, bactericide, insect repellent, animal repellent, microbicide, fungicide, and lampri ...

company owned by the Scotts Miracle-Gro Company

See also