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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «R»:

  1. Radon Radon
    Radon: A radioactive element formed as a gas during the breakdown of radium. ...
  2. Raeder's syndrome Raeder's syndrome
    Raeder's syndrome: A distinctive syndrome of headaches, also known as cluster headache or migrainous neuralgia. The common pattern of cluster headache is termed "episodic" and is characterized by 1-3 short attacks of pain each day around the eyes, clustered over a stretch of 1-2 months, follow...
  3. Ragged red fibers with CPEO Ragged red fibers with CPEO
    Ragged red fibers with CPEO: See: Kearns-Sayre syndrome....
  4. Ragweed Ragweed
    Ragweed: Any of a number of weedy composite herbs that produce a pollen that is a frequent cause of allergies. Of all allergy sufferers in the United States, 75% are allergic to ragweed....
  5. Raised hemidiaphragm Raised hemidiaphragm
    Raised hemidiaphragm: See: Elevated hemidiaphragm....
  6. Rale Rale
    Rale: A type of abnormal lung sound heard through a stethoscope. Rales may be sibilant (whistling), dry (crackling) or wet (more sloshy) depending on the amount and density of fluid refluxing back and forth in the air passages. The word rale is a straight steal from the French rale (minus the circum...
  7. Ramsay Hunt syndrome Ramsay Hunt syndrome
    Ramsay Hunt syndrome: A herpes virus infection of the geniculate nerve ganglion that causes paralysis of the facial muscles on the same side of the face as the infection. The geniculate ganglion is a sensory ganglion associated with the VIIth cranial nerve. The Ramsay Hunt syndrome is usually ass...
  8. Ramsay Hunt, James Ramsay Hunt, James
    Ramsay Hunt, James: Pre-eminent 20th-century American neurologist (1872-1937) who described a number of important diseases. Including: Ramsay Hunt paralysis: An hereditary disorder resembling adult Parkinson's disease, but less severe, characterized by myoclonus and signs of cerebellar dysfunction,...
  9. Ramus Ramus
    Ramus: In anatomy, a branch, such as a branch of a blood vessel or nerve. For example, the ramus acetabularis arteriae circumflexae femoris medialis is the branch of an artery that goes to the socket of the hip joint. The plural of ramus is rami....
  10. Ramus of the mandible Ramus of the mandible
    Ramus of the mandible: One of the two prominent, projecting back parts of the horseshoe-shaped lower jaw bone....
  11. Random Random
    Random: The process by which an outcome is determined solely by chance, for example, by a coin flip. A randomized controlled trial is a clinical trial that involves at least one test treatment and one control treatment and in which the treatments to be administered are selected by a random proce...
  12. Random mating Random mating
    Random mating: Totally haphazard mating with no regard to the genetic makeup (genotype) of the mate so that any sperm has an equal chance of fertilizing any egg. This rarely, if ever, occurs but the concept is important in population genetics. Also called panmixus....
  13. Random number table Random number table
    Random number table: A table of numbers generated in an unpredictable, haphazard sequence. Tables of random numbers are used to create a random sample. A random number table is therefore also called a random sample table. Random numbers were traditionally selected from a printed table. Today random ...
  14. Random numbers Random numbers
    Random numbers: Numbers generated in an unpredictable haphazard sequence; numbers generated by chance alone....
  15. Random sample Random sample
    Random sample: A group selected randomly, solely by chance....