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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «I»:

  1. Islet cell cancer Islet cell cancer
    Islet cell cancer: A rare but highly treatable type of pancreatic cancer that begins in the cells of the pancreas that produce insulin and other hormones. Islet cell cancer can cause the pancreas to produce too much insulin or other hormones. When this happens, the patient may feel weak or dizzy and...
  2. Islet cell carcinoma Islet cell carcinoma
    Islet cell carcinoma: See: Islet cell cancer....
  3. Islet cell tumor Islet cell tumor
    Islet cell tumor: See: Islet cell cancer....
  4. Islets of Langerhans Islets of Langerhans
    Islets of Langerhans: Known as the insulin-producing tissue, the islets of Langerhans do more than that. They are groups of specialized cells in the pancreas that make and secrete hormones. Named after the German pathologist Paul Langerhans (1847-1888), who discovered them in 1869, these cells si...
  5. Iso- Iso-
    Iso-: Equal, like, or similar. Iso- is much used in medicine and science as, for example, in isotonic solution (a solution that has the same salt concentration as cells and blood), isotope (a form of a chemical element with the same atomic number as another element but having a different atomic mass...
  6. Isocellular Isocellular
    Isocellular: Composed of cells of the same size and type. Isocellular is a Greek-Latin hybrid term compounded from the Greek iso- meaning "equal or like" + the Latin cellula, the diminutive of cella, a storeroom....
  7. Isochromosome Isochromosome
    Isochromosome: An abnormal chromosome with two identical arms due to duplication of one arm and loss of the other arm. Isochromosomes are found in some girls with Turner syndrome, patients with the Pallister-Killian syndrome, and some tumors....
  8. Isochromosome 17q Isochromosome 17q
    Isochromosome 17q: An abnormal chromosome 17 with two identical long (q) arms due to duplication of the long arm and loss of the short arm. Isochromosome 17q is the most common isochromosome in cancer. It plays an important role in tumor development and progression. Hematologic malignancies such ...
  9. Isodisomy Isodisomy
    Isodisomy: Remarkable situation where both chromosomes in a pair are from one parent and neither from the other. Isodisomy causes some birth defects and, we suspect, plays a role in cancer. Also called uniparental disomy. ...
  10. Isoflavone Isoflavone
    Isoflavone: A type of plant estrogen (phytoestrogen) found chiefly in soybeans....
  11. Isoform Isoform
    Isoform: A protein that has the same function as another protein but which is encoded by a different gene and may have small differences in its sequence. For example, transforming factor beta (TGF-B) exists in three versions, or isoforms (TGF-B1, TGF-B2, and TGF-B3), each of which can set off a sign...
  12. Isolate Isolate
    Isolate: A group in which mating is always between members of the group. For example, the Amish. ...
  13. Isoleucine Isoleucine
    Isoleucine: An amino acid, one of the 20 building blocks of protein. A dietary essential amino acid, isoleucine is needed for optimal growth in childhood. It is one of the three branched-chain amino acids. Symbol: Ile....
  14. Isometric exercise Isometric exercise
    Isometric exercise: Exercise involving muscular contractions without movement of the involved parts of the body. Isometric exercise is one method of muscular exercise. In contrast, isotonic exercise occurs when a contracting muscle shortens against a constant load, as when lifting a weight. Isometri...
  15. Isometropia Isometropia
    Isometropia: The condition in which both eyes have equal refractive power. If, for example, one eye is myopic (nearsighted), so is the other. Or if one eye is hyperopic (farsighted), so is the other. Or both eyes may have normal refractive power. The term "isometropia" is made up of three parts f...