Ortho

Ortho (from the Greek word ὀρθός meaning "straight" or "correct") may refer to:

In science

• An arene substitution pattern in which two substituents occupy adjacent positions on an aromatic ring
• Chlordane an organochlorine compound that was used as a pesticide
• Ortho Mode Transducer, is a waveguide component
• An Orthochromatic spectrum is any spectrum of light devoid of red

In cartography

• Orthophotography, aerial photography

In mathematics

• Orthogonality
• Orthonormality

In computer science

• Orthographic projection, a means of representing a three-dimensional (3D) object in two dimensions (2D).

In medicine

• Orthomyxovirus - family of viruses to which influenza (causative agent of the flu) 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

In theology

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

Corporations

• Ortho Pharmaceutical, which merged into Ortho-McNeil Pharmaceutical before being bought by Johnson & Johnson
• Ortho-Clinical Diagnostics, another subsidiary of Johnson & Johnson