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Drugs and diseases reference index

Drugs and diseases reference index
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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «O»:

  1. Ornithine transcarbamylase (OTC) deficiency 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...
  2. Ornithophobia Ornithophobia
    Ornithophobia: An abnormal and persistent fear of birds. Sufferers from ornithophobia experience undue anxiety about 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...
  3. Oromandibular dystonia Oromandibular dystonia
    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 be difficult....
  4. Oropharynx Oropharynx
    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....
  5. Orphan disease Orphan disease
    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...
  6. Orphan drug Orphan drug
    Orphan drug: A drug designed to treat or prevent an orphan disease....
  7. ORS ORS
    ORS: 1. Oral rehydration salts. 2. Oral rehydration solution. 3. Orthopaedic Research Society....
  8. Ortho- (prefix) Ortho- (prefix)
    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), ...
  9. Orthodontic treatment (dental braces) 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...
  10. Orthodontics Orthodontics
    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 Amer...
  11. Ortholog Ortholog
    Ortholog: A gene in two or more species that has evolved from a common ancestor. Also called an orthologous gene....
  12. Orthologous gene Orthologous gene
    Orthologous gene: See: Ortholog....
  13. Orthomolecular medicine Orthomolecular medicine
    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...
  14. Orthopaedics Orthopaedics
    Orthopaedics: The branch of surgery broadly concerned with the skeletal system (bones). This particular term is commonly misspelled. Orthopedics is how this field of surgery is listed under Physicians & Surgeons in the telephone Yellow Pages in Jacksonville, Florida. This spelling is quite co...
  15. Orthopaedist Orthopaedist
    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...