Medical terms beginning with O

• Organ donation
• Organelle
• Organic
• Organic brain syndrome
• Organism
• Organophosphates
• Orgasm
• Orgasm, lack of
• Orlistat
• Ornithosis
• Orphan drugs
• Orphenadrine
• Ortho
• Orthodontic appliances
• Orthodontics
• Orthognathic surgery
• Orthopaedics
• Orthopnoea
• Orthoptics
• Orthotics
• Os
• Osmosis
• Ossicle
• Ossification
• Osteitis
• Osteitis deformans
• Osteo-
• Osteoarthritis
• Osteochondritis dissecans
• Osteochondritis juvenilis
• Osteochondroma
• Osteochondrosis
• Osteodystrophy
• Osteogenesis imperfecta
• Osteogenic sarcoma
• Osteoid osteoma
• Osteoma
• Osteomalacia
• Osteomyelitis
• Osteopathy
• Osteopetrosis
• Osteophyte
• Osteoporosis
• Osteosarcoma
• Osteosclerosis
• Osteotomy
• Ostomy
• Otalgia
• Otitis externa
• Otitis media