Medical Dictionary Starting with O

Oat cell cancer	Oophorectomy	Osteodystrophy (renal osteodystrophy)
OB	Open reading frame	Osteogenesis
OB/GYN	Ophthalmia	Osteogenesis imperfecta
Obesity	Ophthalmic	Osteomalacia
Obsessive-compulsive	Ophthalmologist	Osteomyelitis
Obstetrician	Ophthalmology	Osteonecrosis (aseptic necrosis or avascular necrosis)
Obstetrics	Ophthalmopathy	Osteopath
Obtunded	Ophthalmoscope	Osteopathy
Occipital bone	Optic	Osteopetrosis
Occiput	Optic nerve	Osteoporosis
Occular	Optic neuroma	Osteosarcoma
Occult	Optometrist	Osteotomy
OCP	Oral	Ostomy
Ocular	Oral cancer	Otitis
Oesophagus	Oral surgeon	Otitis externa
Ointment	Orbit	Otitis interna
Olfaction	Orbital ridge	Otitis media
Oligo-	Orchiectomy	Oto-
Oligodendroglioma	Orchitis	Otolaryngologist
Oligohydramnios	Orifice	Otoscope
Oligomenorrhea	Oromandibular dystonia	Ounce
Oligonucleotide	Oropharynx	Outpatient
Oligospermia	Ortho-	Ova
Oliguria	Orthodontic treatment (dental braces)	Ovarian cancer
Omentum	Orthopedics	Ovaries
Ommaya reservoir	Orthopedist	Ovary
Omphalocele	Orthopnea	Overgrowth
Oncogene	Orthopod	Overgrowth syndromes
Oncologist	Orthostatic hypotension	Overweight
Onycho-	Osseous	Ovulation
Onychodystrophy	Osteo-	Ovum
Onychoosteodysplasia	Osteoarthritis	Oxyuris
Oocyte	Osteochondroma	oz.
Oogonium