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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «O»:

  1. Onychocryptosis Onychocryptosis
    Onychocryptosis: The medical term for what is better known as an ingrown toenail. From onycho-, nail + crypto-, hidden or buried + -sis, condition. See: Ingrown toenail....
  2. Onychodystrophy Onychodystrophy
    Onychodystrophy: Malformation of the nails....
  3. Onychogryposis Onychogryposis
    Onychogryposis: Abnormally thick curved fingernails or toenails. From the Greek onyx, nail + gryposis, curvature....
  4. Onycholysis Onycholysis
    Onycholysis: Loosening of the nail from the nail bed, usually starting at the border of the nail. The nail tends to turn whitish or yellowish, reflecting the presence of air under it. The treatment is to trim the nail short, do not clean under the nail, and be patient. It generally takes 2 to 3 mont...
  5. Onychomycosis Onychomycosis
    Onychomycosis: Fungal infection of the nails. Fungal infections can involve either the toenails or the fingernails. Nail fungal infection is usually caused by the dermatophyte fungi Trichophyton rubrum which can invade the nail bed. See dermatophytic onychomycosis....
  6. Onychomycosis, proximal white subungual Onychomycosis, proximal white subungual
    Onychomycosis, proximal white subungual: The rarest form of fungus infection of the finger or toenail. (Fungus infection of the finger or toenail is also called onychomycosis.) The infection begins in the nail fold (the portion of the nail opposite the tip of the finger). Proximal white subungual o...
  7. Onychoosteodysplasia Onychoosteodysplasia
    Onychoosteodysplasia: This is the nail-patella syndrome, an hereditary condition characterized by abnormally formed (dysplastic) or absent nails and by absent or underdeveloped (hypoplastic) kneecaps (patellae). Other features of the syndrome include: Iliac horns, Abnormality of the elbows interfer...
  8. Oocyte Oocyte
    Oocyte: A female germ cell in the process of development. The oocyte is produced in the ovary by an ancestral cell called an oogonium and gives rise to the ovum (the egg) which can be fertilized....
  9. Oogenesis Oogenesis
    Oogenesis: The process of egg formation. The second "o" in oogenesis is pronounced separately from the first: o·o·gen·e·sis. The word was created from the prefix "oo-" (Greek oon, egg) + "genesis" (the coming into being of something) = the coming into being of the egg (...
  10. Oogonium Oogonium
    Oogonium: A female ancestral germ cell that divides several times to give rise to an oocyte that, in turn, develops into an ovum (an egg). The second "o" in oogonium is pronounced separately from the first: o·o·gon·i·um. The word was created from the prefix "oo-" (Greek o...
  11. Oophorectomy Oophorectomy
    Oophorectomy: The removal of one or both ovaries by surgery. Also known as ovariectomy. ...
  12. Oophoritis Oophoritis
    Oophoritis: Inflammation of the ovary or egg sac. ...
  13. OPCA OPCA
    OPCA: Olivopontocerebellar atrophy....
  14. Open charting Open charting
    Open charting: The practice of making medical charts available to the patient....
  15. Open cholecystectomy Open cholecystectomy
    Open cholecystectomy: Surgery in which the abdomen is opened to permit cholecystectomy -- removal of the gallbladder. This operation has been employed for over 100 years and is a safe and effective method for treating symptomatic gallstones, ones that are causing significant symptoms. At surgery, d...