Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «O»:
Ornithine transcarbamylase (OTC) deficiency
Ornithine transcarbamylase (OTC) deficiency: A rare metabolic disorder, OTC is one of the urea-cycle disorders. The urea cycle is a series of five liver enzymes that help rid the body of ammonia, a toxic breakdown product of protein. When one of these enzymes is missing or deficient, ammonia accumul...
Ornithophobia: An abnormal
and persistent fear of birds. Sufferers from ornithophobia experience undue
encountering and even being attacked by birds although they may
realize their fears are quite irrational.
Ornithophobia was epitomized in a 1963 film scripted by the novelist Da...
Oromandibular dystonia: Oro- refers to the mouth and
mandibular refers to the lower jaw. Oromandibular dystonia affects the muscles of the jaw,
lips, and tongue. The jaw may be pulled either open or shut, and speech and swallowing can
Oropharynx: The area of the throat that is at the back of the mouth. The oropharynx is in contrast to the nasopharynx, the part of the throat that lies behind the nose....
Orphan disease: A disease which has not been "adopted" by the pharmaceutical industry because it provides little financial incentive for the private sector to make and market new medications to treat or prevent it.
An orphan disease may be:
A rare disease. According to US criteria, an orphan disea...
Orphan drug: A drug designed to treat or prevent an orphan disease....
ORS: 1. Oral rehydration salts.
2. Oral rehydration solution.
3. Orthopaedic Research Society....
Ortho- (prefix): Prefix meaning straight or
erect. From the Greek "orthos" that means just that: straight or
erect. Examples of terms involving ortho- include orthodontics
(straightening the teeth), orthopaedics (straightening the child),
orthopnea (breathing easily only in an upright position), ...
Orthodontic treatment (dental braces)
Orthodontic treatment (dental braces): The use of
devices to move teeth or adjust underlying bone. The ideal age for
starting orthodontic treatment is between ages 3 to 12 years.
Temporomandibular joint (TMJ) problems can be corrected with
splinting or dental braces. Teeth can be moved by remova...
Orthodontics: Orthodontics is the branch of dentistry that
specializes in the diagnosis, prevention and treatment of dental and
facial irregularities. The technical term for these problems
is "malocclusion," which means "bad bite."
Orthodontics is one of the 8 specialties recognized by the
Ortholog: A gene in two or more species that has evolved from a common ancestor. Also called an orthologous gene....
Orthologous gene: See: Ortholog....
Orthomolecular medicine: 1. A term coined by the chemist Linus Pauling who defined it as "the preservation of good health and the treatment of disease by varying the concentration in the human body of substances that are normally present in the body. The treatment of diabetes by the injection of in...
Orthopaedics: The branch of surgery broadly
concerned with the skeletal
system (bones). This particular term is commonly
is how this field of surgery is listed under Physicians &
Surgeons in the
telephone Yellow Pages in Jacksonville, Florida. This
spelling is quite
Orthopaedist: An orthopaedic surgeon, a doctor who corrects
congenital or functional abnormalities of the bones with surgery,
casting, and bracing. Orthopaedists also treat injuries to the bones.
Sometimes spelled orthopedist.The spelling of "orthopedist" with
an "e" is quite
common today but it...