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Drugs and diseases reference index

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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «S»:

  1. Study, gastric emptying Study, gastric emptying
    Study, gastric emptying: A gastric emptying study evaluates the emptying of food from the stomach. For a gastric emptying study, a patient eats a meal in which the solid food, liquid food or both are mixed with a small amount of radioactive material. A scanner (acting like a Geiger counter) is pl...
  2. Study, linkage Study, linkage
    Study, linkage: A study aimed at establishing linkage between genes. Linkage is the tendency for genes and other genetic markers to be inherited together because of their location near one another on the same chromosome. A gene is a functional physical unit of heredity that can be passed from paren...
  3. Study, longitudinal Study, longitudinal
    Study, longitudinal: A study done over the passage of time. For example, a longitudinal study of children with Down syndrome (trisomy 21) might involve the study of 100 children with this condition from birth to 10 years of age. Also called a diachronic study. The opposite of a cross-sectional (sync...
  4. Study, preclinical Study, preclinical
    Study, preclinical: A study to test a drug, procedure or medical treatment in animals. The aim is to collect data in support of safety. Preclinical studies are required before clinical trials can be started....
  5. Study, stomach emptying Study, stomach emptying
    Study, stomach emptying: Also called a gastric emptying study, this test evaluates the emptying of food from the stomach. For a gastric emptying study, a patient eats a meal in which the solid food, liquid food or both are mixed with a small amount of radioactive material. A scanner (acting like ...
  6. Study, synchronic Study, synchronic
    Study, synchronic: See: Study, cross-sectional. ...
  7. Stuffy nose Stuffy nose
    Stuffy nose: The presence of increased secretions and mucus in the nasal passages, most commonly arising as a result of a common cold, allergic reaction, or inflammation or infection of the paranasal sinuses (sinus infection)....
  8. Sturge-Weber syndrome Sturge-Weber syndrome
    Sturge-Weber syndrome: A congenital, but not inherited, disorder that affects the skin, the neurological system, and sometimes the eyes and internal organs. The main sign of Sturge-Weber syndrome is a port wine stain birthmark. Neurological symptoms may include seizures and developmental delay...
  9. Stye Stye
    Stye: A stye is a red tender bump on the eyelid that is caused by an acute infection of the oil glands of the eyelid. A stye can also be a complication of blepharitis. Other spellings, sty...
  10. Sub- Sub-
    Sub-: Prefix meaning meaning under, below, less than normal, secondary, less than fully. As in subacute, subaortic stenosis, subarachnoid, subclavian, subclinical disease, subcutaneous, subdural, subglottis, subjacent, sublingual, subluxation, and subtotal hysterectomy. From the Latin preposition...
  11. Subacute Subacute
    Subacute: Rather recent onset or somewhat rapid change. The term "subacute" is used in contrast to acute which indicates very sudden onset or rapid change and chronic which indicates indefinite duration or virtually no change. A chronic condition is one lasting 3 months or more, by the definition of...
  12. Subacute sclerosing panencephalitis (SSPE) Subacute sclerosing panencephalitis (SSPE)
    Subacute sclerosing panencephalitis (SSPE): A chronic brain disease of children and adolescents that occurs months to often years after an attack of measles, causing convulsions, motor abnormalities, mental retardation and, usually, death. ...
  13. Subacute spongiform encephalopathy Subacute spongiform encephalopathy
    Subacute spongiform encephalopathy: See: Gerstmann-Straussler-Scheinker syndrome....
  14. Subaortic stenosis Subaortic stenosis
    Subaortic stenosis: Narrowing of the left ventricle of the heart just below the aortic valve through which blood must pass on its way up into the aorta. The narrowing cuts the flow of blood. Subaortic stenosis may be congenital (present at birth) or acquired as part of a particular form of...
  15. Subarachnoid Subarachnoid
    Subarachnoid: Literally, beneath the arachnoid, the middle of three membranes that cover the central nervous system. In practice, subarachnoid usually refers to the space between the arachnoid and the pia mater, the innermost membrane surrounding the central nervous system. The subarachnoid space i...