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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. Penis Penis
    Penis: The external male sex organ used to copulate and ejaculate semen and to convey urine outside the body. The penis contains two chambers, the corpora cavernosa, which run the length of the organ. These are filled with spongy tissue and surrounded by a membrane called the tunica albuginea. Th...
  2. Penis, cancer of the Penis, cancer of the
    Penis, cancer of the: Cancer of the penis is a disease in which cancer (malignant) cells originate in the tissues of the penis. Cancer of the penis is rare in the United States. Men who are not circumcised at birth may have a higher risk for getting cancer of the penis. (A circumcision is an o...
  3. Penis, erection of the Penis, erection of the
    Penis, erection of the: When the penis fills with blood and is rigid. The penis contains two chambers, called the corpora cavernosa, which run the length of the organ, are filled with spongy tissue, and surrounded by a membrane, called the tunica albuginea. The spongy tissue contains smooth muscles,...
  4. Penis, hypospadias of the Penis, hypospadias of the
    Penis, hypospadias of the: birth defect of the penis involving the urethra (the transport tube leading from the bladder to discharge urine outside the body). The urethra in the male normally travels through the full length of the penis so that the stream of urine comes from the usual urethral open...
  5. Penis, inflammation of the foreskin and glans Penis, inflammation of the foreskin and glans
    Penis, inflammation of the foreskin & glans: 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 ...
  6. Penis, inflammation of the head of the Penis, inflammation of the head of the
    Penis, inflammation of the head of the: Inflammation of the rounded head (the glans) of the penis is called balanitis. In the uncircumcised male, balanitis and posthitis (inflammation of the foreskin) usually occur together as balanoposthitis: inflammation of both the glans and foreskin. Circumcisio...
  7. Penis, small Penis, small
    Penis, small: A penis that is abnormally small, also known as micropenis. In medical practice, the dimension of the penis that is measured is the length. This measurement is taken along the upper surface of the shaft of the penis to the tip, using a measuring tape or preferably a ruler. The r...
  8. Penrose drain Penrose drain
    Penrose drain: A soft tube-shaped rubber or silicone drain. Named for the American gynecologist Charles Bingham Penrose (1862-1925)....
  9. Pentapeptide Pentapeptide
    Pentapeptide: A peptide consisting of five amino acids....
  10. PEP PEP
    PEP: The abbreviation PEP stands for a number of things in medicine including post-exposure prophylaxis. Prophylaxis means a defense or protection. Post-exposure prophylaxis, for example, might concern the treatment of a health care worker exposed by a needle stick to HIV with a drug such as AZT to ...
  11. Peptic ulcer Peptic ulcer
    Peptic ulcer: A hole in the lining of the stomach, duodenum, or esophagus. A peptic ulcer of the stomach is called a gastric ulcer, an ulcer of the duodenum is a duodenal ulcer, and a peptic ulcer of the esophagus is an esophageal ulcer. A peptic ulcer occurs when the lining of these organs is corro...
  12. Peptidase Peptidase
    Peptidase: An enzyme that can break down a peptide into its component amino acids....
  13. Peptide Peptide
    Peptide: A molecule consisting of 2 or more amino acids. Peptides are smaller than proteins, which are also chains of amino acids. Molecules small enough to be synthesized from the constituent amino acids are, by convention, called peptides rather than proteins. The dividing line is at about 50 amin...
  14. Peptidomimetic Peptidomimetic
    Peptidomimetic: A compound that mimics the biological action of a peptide....
  15. Peptidyl-prolyl cis/trans isomerase Peptidyl-prolyl cis/trans isomerase
    Peptidyl-prolyl cis/trans isomerase: An enzyme also known as Pin1. See: Pin1....