Oligomenorrhea
Limited menstrual discharge
Oncology
Study of tumor like tissue
Onychectomy
Removal of a nail
Onychocryptosis
Ingrown nail
Onychomycosis
Fungal condition in the nail
Onychophagia
Eating your nails
Oophoritis
Inflammation of the ovary
Oophorectomy
Removal of an ovary
Orchiepididymitis
Inflammation of the epididymis and testis
Orchioplasty
Repair of the testis
Orchidectomy
Removal of both or one testis
Orchidotomy
Incision made into the testis
Oximeter
A device used to measure oxygen saturation of the blood