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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «A»:

  1. Acoustic nerve Acoustic nerve
    Acoustic nerve: A cranial nerve concerned with hearing, balance and head position. The acoustic nerve is the 8th cranial nerve. It branches into two parts -- a cochlear part integral to hearing and a vestibular part which mediates the sense of balance and head position. Also called the vestibulococh...
  2. Acoustic neurinoma Acoustic neurinoma
    Acoustic neurinoma: A benign tumor that may develop on the hearing and balance nerves near the inner ear. The tumor results from an overproduction of Schwann cells -- small sheet-like cells that normally wrap around nerve fibers like onion skin and help support the nerves. When growth is abnormally ...
  3. Acoustic neurofibromatosis Acoustic neurofibromatosis
    Acoustic neurofibromatosis: See: Neurofibromatosis type 2....
  4. Acoustic neuroma Acoustic neuroma
    Acoustic neuroma: A benign tumor that may develop on the hearing and balance nerves near the inner ear. The tumor results from an overproduction of Schwann cells -- small sheet-like cells that normally wrap around nerve fibers like onion skin and help support the nerves. When growth is abnormally ex...
  5. ACP (American College of Physicians) ACP (American College of Physicians)
    ACP (American College of Physicians): See: American College of Physicians....
  6. Acquired Acquired
    Acquired: Anything that is not present at birth but develops some time later. In medicine, the word "acquired" implies "new" or "added." An acquired condition is "new" in the sense that it is not genetic (inherited) and "added" in the sense that was not present at birth. For example, AIDS (the a...
  7. Acquired deafness Acquired deafness
    Acquired deafness: The loss of hearing that occurs or develops some time during a person's life but was not present at birth. Acquired deafness contrasts to congenital deafness which is present at birth. The distinction between acquired and congenital deafness specifies only the time that the deafn...
  8. Acquired epileptiform aphasia Acquired epileptiform aphasia
    Acquired epileptiform aphasia: See Landau-Kleffner syndrome....
  9. Acquired immunity Acquired immunity
    Acquired immunity: Immunity acquired by infection or vaccination (active immunity) or by the transfer of antibody or lymphocytes from an immune donor (passive immunity). Acquired immunity is in contrast to innate immunity (natural immunity)....
  10. Acquired immunodeficiency syndrome Acquired immunodeficiency syndrome
    Acquired immunodeficiency syndrome: AIDS. AIDS is a disease due to infection with the human immunodeficiency virus (HIV). Also referred to as acquired immunodeficiency disease....
  11. Acquired mutation Acquired mutation
    Acquired mutation: A mutation (a genetic change) acquired by a somatic cell after conception. Acquired mutations occur in somatic cells, not germ cells, and so cannot be transmitted to the children. However, acquired mutations are transmitted to all cells descended from the mutant cell, giving rise...
  12. Acral-lentiginous melanoma Acral-lentiginous melanoma
    Acral-lentiginous melanoma: See: Melanoma, acral-lentiginous....
  13. Acrocentric chromosome Acrocentric chromosome
    Acrocentric chromosome: A chromosome (one of the microscopically visible carriers of the genetic material DNA) with its centromere (the "waist" of the chromosome) located quite near one end of the chromosome. The "acro-" in acrocentric comes from the Greek "akron" meaning "the end." Humans have...
  14. Acrocephalosyndactyly Acrocephalosyndactyly
    Acrocephalosyndactyly: An inherited disorder causing abnormalities of the skull and face and the hands and feet. In acrocephalosyndactyly there is closure too-early of some of the sutures of the skull (craniosynostosis). This results in an abnormally shaped head, which is unusually tall and ...
  15. Acrochordon Acrochordon
    Acrochordon: A small tag of skin that may have a stalk (a peduncle). An acrochordon may appear on skin anywhere although the favorite locales are the eyelids, neck, armpits (axillae), upper chest, and groin. Invariably benign, this tiny tumor of the skin usually causes no symptoms unless repeated...