Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «O»:
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....
Onychodystrophy: Malformation of the nails....
Onychogryposis: Abnormally thick curved fingernails or toenails. From the Greek onyx, nail + gryposis, curvature....
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...
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
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...
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:
Abnormality of the elbows interfer...
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....
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 (...
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...
Oophorectomy: The removal of one or both
ovaries by surgery. Also known as ovariectomy. ...
Oophoritis: Inflammation of the ovary or egg sac.
OPCA: Olivopontocerebellar atrophy....
Open charting: The practice of making medical
charts available to the patient....
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...