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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «B»:

  1. Bag of waters Bag of waters
    Bag of waters: Popular name for the amniotic sac together with the amniotic fluid within it. The amniotic sac is formed by the amnion within the uterus and encloses the fetus. This sac bursts normally during the birthing process, releasing the amniotic fluid. Also known as the amniotic sac....
  2. Bag, air Bag, air
    Bag, air: A bag that fills with air, designed for frontal impact crashes, the kind of crashes which account for more than half of all passenger vehicle occupant deaths. Air bags are designed to limit head and chest injuries. But they only supplement safety belts, they do not replace them. During pr...
  3. Baker cyst Baker cyst
    Baker cyst: A swelling in the space behind the knee (the popliteal space) composed of a membrane-lined sac filled with synovial fluid that has escaped from the joint. Baker cyst is named after the British surgeon William Morrant Baker (1839-1896). Also called a synovial cyst of the popliteal spac...
  4. Baker's yeast Baker's yeast
    Baker's yeast: Saccharomyces cerevisiae....
  5. Balance Balance
    Balance: A biological system that enables us to know where our bodies are in the environment and to maintain a desired position. Normal balance depends on information from the inner ear, other senses (such as sight and touch) and muscle movement. Our sense of balance is specifically regulated by a c...
  6. Balance, acid-base Balance, acid-base
    Balance, acid-base: Acid-base balance refers to the mechanisms the body uses to keep its fluids close to neutral pH (that is, neither basic nor acidic) so that the body can function normally....
  7. Balance, sense of Balance, sense of
    Balance, sense of: Our sense of balance is regulated by a complex interaction of the following parts of the nervous system: The inner ears (also called the labyrinth) monitor the directions of motion, such as turning or forward-backward, side-to-side, and up-and-down motions. The eyes observe wher...
  8. Balanitis Balanitis
    Balanitis: Inflammation of the rounded head (the glans) of the penis. Inflammation of the foreskin is called posthitis. In the uncircumcised male, balanitis and posthitis generally occur together as balanoposthitis: inflammation of both the glans and foreskin. ...
  9. Balanitis, circinate Balanitis, circinate
    Balanitis, circinate: A form of skin inflammation around the penis in males with Reiter's syndrome. The skin around the shaft and tip (glans) penis can become inflamed and scale. This inflammation around the penis can be helped by cortisone creams (such as TOPICORT). Reiter's syndrome is a systemic...
  10. Balanoposthitis Balanoposthitis
    Balanoposthitis: In the uncircumcised male, balanitis (inflammation of the glans, the rounded head of the penis) and posthitis (inflammation of the foreskin) usually occur together as balanoposthitis: inflammation of both the glans and foreskin. Circumcision prevents balanoposthitis. Without a fores...
  11. Balantidiasis Balantidiasis
    Balantidiasis: The disease caused by infection with the protozoan parasite Balantidium....
  12. Balantidium Balantidium
    Balantidium: A genus of protozoa with cilia that includes Balantidium coli (B. coli). B. coli is the largest protozoan and the only ciliate parasite to infect humans. The disease that B. coli causes is called balantidiasis. Clinical features, when present, include persistent diarrhea, occasionally d...
  13. Baldness Baldness
    Baldness: Medically known as alopecia. There are many types of baldness, each with a different cause. Baldness may be localized to the front and top of the head, as in the very common type of male-pattern baldness; baldness may be patchy, a condition called alopecia areata; or it may involve the ...
  14. Baldness, patchy Baldness, patchy
    Baldness, patchy: Patchy baldness. Also referred to as alopecia areata. Alopecia means baldness and areata means occurring in patches. This process typically begins with patchy hair loss on the scalp and sometimes progresses to complete baldness and even loss of body hair. The hair loss tends ...
  15. Ball-and-socket joint Ball-and-socket joint
    Ball-and-socket joint: A ball-and-socket joint is one in which the round end of a bone fits into the cavity of another bone. The hip joint is a ball-and-socket joint....