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Drugs and diseases reference index

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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. PRK (photorefractive keratectomy) PRK (photorefractive keratectomy)
    PRK (photorefractive keratectomy): A kind of laser eye surgery designed to change the shape of the cornea to eliminate (or reduce) the need for glasses and contact lenses. The laser is used to remove the outer layer of the cornea and flatten the cornea. The flattening of the cornea is intended...
  2. PRKAR1A PRKAR1A
    PRKAR1A: Stands for Protein Kinase A Regulatory subunit 1-alpha. A multiple neoplasia syndrome called type I Carney complex is due to mutation of the PRKAR1A gene, which is on chromosome 17q23-q24. See also: Carney complex....
  3. Pro Pro
    Pro: Proline. See also: Amino acid symbols....
  4. Pro time Pro time
    Pro time: The pro time (or, more properly, the prothrombin time) is a test of the integrity of part of the clotting scheme. The prothrombin time is also commonly used as a method of monitoring the accuracy of blood thinning treatment (anticoagulation) with drugs such as Coumadin. The pro(thrombin...
  5. Probability Probability
    Probability: The likelihood that something will happen. For example, a probability of less than .05 indicates that the probability of something occurring by chance alone is less than 5 in 100, or 5 percent. This level of probability is usually taken as the level of biologic significance, so a hi...
  6. Proband Proband
    Proband: The family member through whom a family's medical history comes to light. For example, a proband might be a baby with Down syndrome. The proband may also be called the index case, propositus (if male), or proposita (if female)....
  7. Probe Probe
    Probe: (1) In surgery, a probe is a slender flexible rod with a blunt end used to explore, for example, an opening to see where it goes. (2) In molecular genetics, a probe is a labeled bit of DNA or RNA used to find its complementary sequence or locate a particular clone like homing in on a needle i...
  8. Probiotic Probiotic
    Probiotic: A microbe that protects its host and prevents disease. The best-known probiotic is Lactobacillus acidophilus, which is found in yogurt, acidophilus milk, and supplements. Probiotics counter the decimation of helpful intestinal bacteria by antibiotics. Probiotics given in combination with ...
  9. Probiotics Probiotics
    Probiotics: live microorganisms (usually bacteria) that are similar to beneficial microorganisms found in the human gut that are taken as dietary supplements or found in foods. Most probiotics are bacteria similar to those naturally found in the intestine. Common examples...
  10. PROC PROC
    PROC: Protein C ...
  11. Procedure, Whipple Procedure, Whipple
    Procedure, Whipple: See: Whipple procedure....
  12. Process Process
    Process: In anatomy, a process is a projection from a structure. The process of the mandible is the part of the lower jaw that projects forward. In a more general sense, a process is a series of actions or events that are part of a system or of a development, particularly one characterized by gradua...
  13. Proclivity Proclivity
    Proclivity: An inclination or predisposition toward something, especially a strong inherent inclination toward something objectionable. For example, a patient might be said to have a proclivity toward alcohol....
  14. Procollagen Procollagen
    Procollagen: A precursor (forerunner) of collagen, the protein that adds strength and support to many body tissues....
  15. Proctitis Proctitis
    Proctitis: Inflammation of the rectum. This may be due to a considerable number of causes, among them infectious agents and ulcerative colitis. Infectious proctitis is often due to agents such as Chlamydia trachomatis, Neisseria gonorrheae (the bacteria that causes gonorrhea) and herpes simplex vi...