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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. Piercing Piercing
    Piercing: Using a sharp instrument, usually a needle, to make a temporary or permanent hole through an earlobe or other body part. Humans have practiced piercing for body decoration since prehistoric times. Unless it is performed using a sterile needle (preferably disposable), piercing can ca...
  2. Pigeon breast Pigeon breast
    Pigeon breast: Prominence of the breast bone (sternum). Medically, pigeon breast is called pectus carinatum. ...
  3. PIGF PIGF
    PIGF: Placental growth factor....
  4. Pigment Pigment
    Pigment: A substance that gives color to tissue. Pigments are responsible for the color of skin, eyes, and hair....
  5. Pigmentation Pigmentation
    Pigmentation: The coloring of the skin, hair, mucous membranes, and retina of the eye. Pigmentation is due to the deposition of melanin which is a coloring matter. The melanin is produced by specialized cells called melanocytes. Other pigmented terms include hyperpigmentation (too much pigment), hyp...
  6. Pigmented villonodular synovitis Pigmented villonodular synovitis
    Pigmented villonodular synovitis: A benign proliferative form of monoarthritis (arthritis in just one joint) that can occurs at any age but is most common in adults age 20-50. The joint most often affected is the knee with the hip, ankle, and shoulder affected less commonly. Pigmented villonodular ...
  7. Piles Piles
    Piles: 1. A term in use since the 15th century for hemorrhoids. 2. A street name for crack cocaine....
  8. Pill Pill
    Pill: In pharmacy, a medicinal substance in a small round or oval mass meant to be swallowed. Pills often contain a filler and a plastic substance such as lactose that permits the pill to be rolled by hand or machine into the desired form. The pill may then be coated with a varnishlike substance. Th...
  9. Pill splitter Pill splitter
    Pill splitter: A device for tablet splitting....
  10. Pill splitting Pill splitting
    Pill splitting: See: Tablet splitting....
  11. Pill, the Pill, the
    Pill, the: Commonly called "the pill," combined oral contraceptives are the most commonly used form of reversible birth control in the United States. This form of birth control suppresses ovulation (the monthly release of an egg from the ovaries) by the combined actions of the hormon...
  12. Piloerection Piloerection
    Piloerection: Erection of the hair of the skin. Piloerection of the hair, for example, on the arm makes it "stand on end." Piloerection starts when a stimulus such as cold or fright causes a discharge from the (involuntary) nervous system that triggers contraction of the little arrectores pilorum...
  13. Pilonidal Pilonidal
    Pilonidal: Refers to an embedded (ingrown) hair or tuft of hair. Literally, a nest of hair. From the Latin pilus (meaning hair) and nidus (meaning nest)....
  14. Pilonidal cyst Pilonidal cyst
    Pilonidal cyst: A special kind of abscess that occurs in the cleft between the buttocks. Forms frequently in adolescence after long trips that involve sitting. The word "pilonidal" is derived from the Latin words pilus (meaning hair) and nidus (meaning nest)....
  15. Pilonidal sinus Pilonidal sinus
    Pilonidal sinus: A sinus tract from which there may be chronic drainage of pus, due to an embedded tuft of hair, most often in the crease between the buttocks, but can occur elsewhere in the body, as between the fingers in barbers, hairdressers, and animal groomers. Surgical removal of the hair and...