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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 - «S»:

  1. Spondylolysis Spondylolysis
    Spondylolysis:The breaking down (dissolution) of a portion of a bony building block of the spine (a vertebra). The portion of the vertebra that is affected in spondylolysis is a bone segment called the pars interarticularis (which is part of a plate which is located, in technical terms, between t...
  2. Spondylosis Spondylosis
    Spondylosis: Degeneration of the disc spaces between the vertebrae. This finding in the spine is commonly associated with osteoarthritis....
  3. Sponge, vaginal contraceptive Sponge, vaginal contraceptive
    Sponge, vaginal contraceptive: See: Vaginal contraceptive sponge....
  4. Spongiform Spongiform
    Spongiform: Resembling a sponge in being soft and full of cavities, as in as in transmissible spongiform encephalopathy....
  5. Spongiform encephalopathy and cerebral amyloidosis Spongiform encephalopathy and cerebral amyloidosis
    Spongiform encephalopathy & cerebral amyloidosis: See: Gerstmann-Straussler-Scheinker syndrome....
  6. Spongy degeneration of the central nervous system Spongy degeneration of the central nervous system
    Spongy degeneration of the central nervous system: Also called Canavan disease, this is a severe progressive fatal inherited (genetic) disorder of the central nervous system (CNS). The signs of Canavan disease usually appear when the children are between 3 and 6 months of age. They include developm...
  7. Spontaneous abortion Spontaneous abortion
    Spontaneous abortion: A miscarriage, that is, any pregnancy that is not viable (the fetus cannot survive) or in which the fetus is born before the 20th week of pregnancy. Spontaneous abortion occurs in at least 15-20% of all recognized pregnancies and usually takes place before the 13th week of ...
  8. Sporadic Sporadic
    Sporadic: Occurring upon occasion or in a scattered, isolated or seemingly random way. A disorder that is sporadic is by definition neither an endemic, an epidemic, nor a pandemic: An endemic is present in a community at all times but in low frequency. An endemic is continuous, as in the case ...
  9. Sporadic primary pulmonary hypertension Sporadic primary pulmonary hypertension
    Sporadic primary pulmonary hypertension: See: Pulmonary hypertension....
  10. Sporotrichosis Sporotrichosis
    Sporotrichosis: An infection most commonly of the skin caused by the fungus Sporothrix schenckii. Persons handling thorny plants, sphagnum moss, or baled hay are at increased risk of developing sporotrichosis. Outbreaks of sporotrichosis have occurred among nursery workers handling sphagnum m...
  11. Spot, blind Spot, blind
    Spot, blind: In ophthalmology, a blind spot is: A small area of the retina where the optic nerve enters the eye; this type of blind spot occurs normally in all eyes. Any gap in the visual field corresponding to an area of the retina where no visual cells are present; this type of blind spot is as...
  12. Spot, histo Spot, histo
    Spot, histo: See: Histo spot....
  13. Spots in front of the eyes Spots in front of the eyes
    Spots in front of the eyes: Also known as "floaters", blurry spots that drift in front of the eyes but do not block vision. The blur is the result of debris from the vitreous casting a shadow on the retina. The spot is the image formed by a deposit of protein drifting about in the vitreous, the cle...
  14. Spots, Brushfield's Spots, Brushfield's
    Spots, Brushfield's: Speckled iris. Little white spots that slightly elevated on the surface of the iris and are arranged in a ring concentric with the pupil. These spots occur in normal children but are far more frequent in Down's syndrome (trisomy 21). They were described in 1924 by Thomas...
  15. Spots, Koplik's Spots, Koplik's
    Spots, Koplik's: Little spots inside the mouth that are highly characteristic of the early (prodromal) phase of measles (rubeola). The spots look like a tiny grains of white sand, each surrounded by a red ring. They are found especially on the inside of the cheek (the buccal mucosa) opposi...