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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «D»:

  1. Dyscalculia Dyscalculia
    Dyscalculia: A specific developmental disability affecting a person's ability to conceptualize and perform mathematics. Mild cases can often be compensated for with use of a calculator, but those with severe dyscalculia will need special education services....
  2. Dyscrasia Dyscrasia
    Dyscrasia: Any disease condition, especially in hematology, as in "blood dyscrasias." The term "dyscrasia" was borrowed from the Greek meaning "a bad mixture" referring to imbalance between the four humors which caused disease....
  3. Dysentery Dysentery
    Dysentery: Inflammation of the intestine, often with pain, diarrhea, bloody stools, etc. It is usually caused by infestation of the bowel by an ameba. Dysentery can be fatal, usually due to severe dehydration. Treatment includes rapid rehydration, sometimes via IV, and medication. From the Gree...
  4. Dysentery, amebic Dysentery, amebic
    Dysentery, amebic: Dysentery (inflammation of the intestine) with ulcers in the colon due to infection with an ameba (Entamoeba histolytica). This single-celled parasite is transmitted to humans via contaminated water and food. Amebic dysentery can be accompanied by amebic infection of the li...
  5. Dysfunction Dysfunction
    Dysfunction: Difficult function or abnormal function. There is, for example: Constitutional hepatic dysfunction, (familial nonhemolytic jaundice), Dental dysfunction (abnormal functioning of dental structures), Minimal brain dysfunction (attention deficit disorder), Placental dysfunction (dysmatur...
  6. Dysfunction, erectile Dysfunction, erectile
    Dysfunction, erectile: A consistent inability to sustain an erection sufficient for sexual intercourse. Also commonly known as "impotence." Medically, the term "erectile dysfunction" is used to differentiate impotence from other problems that interfere with sexual intercourse ...
  7. Dysfunction, orgasmic Dysfunction, orgasmic
    Dysfunction, orgasmic: See: Anorgasmia....
  8. Dysgraphia Dysgraphia
    Dysgraphia: A specific developmental disability that affects the person's ability to write. Problems may include fine-motor muscle control of the hands and/or processing difficulties. Sometimes occupational therapy is helpful. Most successful students with dysgraphia that does not respond to oc...
  9. Dyshidrotic eczema Dyshidrotic eczema
    Dyshidrotic eczema: Irritation of the skin on the palms of hands and soles of the feet characterized by clear, deep blisters that itch and burn....
  10. Dyskeratosis congenita Dyskeratosis congenita
    Dyskeratosis congenita: An inherited cause of bone-marrow failure, dyskeratosis congenita is a syndrome characterized by abnormal excess skin pigmentation, abnormal or absent nails, and mucosal leukoplakia (white premalignant areas on the lips and conjunctiva of the eyes and in the mouth, anus, and ...
  11. Dyskinesia Dyskinesia
    Dyskinesia: Difficulty or distortion in performing voluntary movements, as in tic, chorea, spasm, or myoclonus. The term dyskinesia may be used in relation to Parkinson's disease and other extrapyramidal disorders. Dyskinesia can occur as a side effect of certain medications such as L-dopa and the a...
  12. Dyslexia Dyslexia
    Dyslexia: A specific reading disability due to a defect in the brain's processing of graphic symbols. Dyslexia is a learning disability that alters the way the brain processes written material. Two commonly held beliefs about dyslexia are that children with it are prone to seeing...
  13. Dyslipidemia Dyslipidemia
    Dyslipidemia: A disorder of lipoprotein metabolism, including lipoprotein overproduction or deficiency. Dyslipidemias may be manifested by elevation of the total cholesterol, the "bad" low-density lipoprotein (LDL) cholesterol and the triglyceride concentrations, and a decrease in the "good" high-de...
  14. Dysmetabolic syndrome X Dysmetabolic syndrome X
    Dysmetabolic syndrome X: A constellation of metabolic abnormalities in serum or plasma insulin/glucose level ratios, lipids (triglycerides, LDL cholesterol subtypes and/or HDL cholesterol), uric acid levels, coagulation factor imbalances and vascular physiology. (This is the official definition by t...
  15. Dysmorphic feature Dysmorphic feature
    Dysmorphic feature: A body characteristic that is abnormally formed. A malformed ear, for example, is a dysmorphic feature. Dysmorphology is a term coined by Dr. David W. Smith in the 1960's to describe the study of human congenital malformations (birth defects), particularly those affecting the...