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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 - «A»:

  1. Adamantine Adamantine
    Adamantine: In dentistry, relating to the enamel of the teeth. Adamantine comes from the Greek and Latin word adamas which applied to substances having the hardness or luster of a diamond. Adamantine figuratively means unyielding and inflexible....
  2. Adams-Stokes disease Adams-Stokes disease
    Adams-Stokes disease: Sudden collapse into unconsciousness due to a disorder of heart rhythm in which there is a slow or absent pulse resulting in syncope (fainting) with or without convulsions. In this condition, the normal heartbeat passing from the upper chambers of the heart to the lower chambe...
  3. ADAMTS2 ADAMTS2
    ADAMTS2: A gene that encodes a metalloproteinase enzyme. This enzyme is responsible for processing type I, type II, and type V procollagen proteins. Procollagens are the precursors of collagens, the proteins that add strength and support to many body tissues. Specifically, this enzyme clips a short...
  4. Adapter protein Adapter protein
    Adapter protein: A protein acts as a connecting molecule. An adapter protein is critical to intermolecular interactions and plays a role in the regulation of signal transduction initiated by engagement of surface receptors on all cell types. Some adapter proteins are expressed in all tissues, while ...
  5. ADCC (antibody-dependent cell-mediated cytotox.) ADCC (antibody-dependent cell-mediated cytotox.)
    ADCC (antibody-dependent cell-mediated cytotoxicity): An immune response in which antibodies, by coating target cells, makes them vulnerable to attack by immune cells. Antibody-dependent cell-mediated cytotoxicity is commonly (and blissfully) abbreviated ADCC....
  6. ADD (attention deficit disorder) ADD (attention deficit disorder)
    ADD (attention deficit disorder): An inability to control behavior due to difficulty in processing neural stimuli. In November, 1998 the National Institutes of Health (NIH) issued a consensus report developed by a panel of experts. The panel concluded that: Ritalin and other therapies may correct...
  7. Addiction Addiction
    Addiction: A chronic relapsing condition characterized by compulsive drug-seeking and abuse and by long-lasting chemical changes in the brain. Addiction is the same irrespective of whether the drug is alcohol, amphetamines, cocaine, heroin, marijuana, or nicotine. Every addictive substance induces p...
  8. Addiction, computer Addiction, computer
    Addiction, computer: See: Computer addiction....
  9. Addison anemia Addison anemia
    Addison anemia: A blood disorder caused by a lack of vitamin B12. Patients who have this disorder do not produce the substance in the stomach that allows the body to absorb vitamin B12. This substance is called intrinsic factor (IF). Addison anemia, better known today as pernicious anemia (PA),...
  10. Addison disease Addison disease
    Addison disease: Long-term underfunction of the outer portion of the adrenal gland. In medical terms, chronic insufficiency of the adrenal cortex. This may be due to a number of different insults to the adrenal including physical trauma, hemorrhage, and tuberculosis of the adrenal, and destructio...
  11. Addisonian anemia Addisonian anemia
    Addisonian anemia: A blood disorder caused by a lack of vitamin B12. Patients who have this disorder do not produce the substance in the stomach that allows the body to absorb vitamin B12. This substance is called intrinsic factor (IF). Addisonian anemia, also called pernicious anemia (PA), is ...
  12. Additive genetic effects Additive genetic effects
    Additive genetic effects: A mechanism of quantitative inheritance such that the combined effects of genetic alleles at two or more gene loci are equal to the sum of their individual effects....
  13. Adducted thumbs with mental retardation Adducted thumbs with mental retardation
    Adducted thumbs with mental retardation: A syndrome with the following characteristic features: neurologically: mental retardation and aphasia (lack of speech) limbs: adducted (clasped) thumbs, absent extensor pollicis longus and/or brevis muscles to the thumb, shuffling gait, and leg ...
  14. Adduction Adduction
    Adduction: Movement of a limb toward the midline of the body. The opposite of adduction is abduction. An adductor muscle pulls toward the midline of the body. For example, the adductor muscles of the legs pull the legs toward the midline of the body so the legs are closer together. From the Latin p...
  15. Adductor muscle Adductor muscle
    Adductor muscle: Any muscle that pulls a body part toward the midline. For example, the adductor muscles of the legs pull the legs toward the midline of the body so the legs are closer together. The word "adductor" comes from the Latin prefix "ad" meaning "toward" + "ducere" meaning "to draw or lea...