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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. Prominent vertebra Prominent vertebra
    Prominent vertebra: The 7th cervical (neck) vertebra (C7) is sometimes called the prominent vertebra because of the length of its spinous process (the projection off the back of the vertebral body). The spinous process of the top thoracic vertebra (T1) just below C7 is sometimes even more prominent ...
  2. Prominentia laryngea Prominentia laryngea
    Prominentia laryngea: The prominence of the larynx, more commonly known as the Adam's apple. This familiar feature in front of the neck is due to forward protrusion of the largest cartilage of the larynx. It takes its name from the story that a piece of the forbidden fruit stuck in Adam's throat...
  3. PROMM PROMM
    PROMM: Proximal myotonic myopathy. See: Myotonic dystrophy type 2....
  4. Promoter Promoter
    Promoter: In molecular biology, a site on DNA to which the enzyme RNA polymerase can bind and initiate the transcription of DNA into RNA....
  5. Pronation Pronation
    Pronation: Rotation of the forearm and hand so that the palm is down (and the corresponding movement of the foot and leg with the sole down), as opposed to supination. For a more complete listing of terms used in medicine for spatial orientation, please see the entry to "Anatomic Orientation Terms"....
  6. Pronator foot type Pronator foot type
    Pronator foot type: A type of foot that rolls far inward during the weight-bearing phase of the stride. This type of foot is characterized by a very low or flat arch. Heavier people often have feet of this type....
  7. Prone Prone
    Prone: With the front (or ventral) surface downward. To lie prone is to lie face downward. Prone is as opposed to supine. For a more complete listing of terms used in medicine for spatial orientation, please see the entry to "Anatomic Orientation Terms"....
  8. Prontosil Prontosil
    Prontosil: The first sulfa drug to be discovered. Largely of historic interest today. The discovery was made by the great German physician and chemist Gerhard Domagk (1895-1964). In 1925 Domagk was named Lecturer in Pathologic Anatomy (pathology) in the University of Munster (where he spend most of...
  9. Pronucleus Pronucleus
    Pronucleus: A cell nucleus with a haploid set of chromosomes (23 chromosomes in humans) resulting from meiosis (germ-cell division). The male pronucleus is the sperm nucleus after it has entered the ovum at fertilization but before fusion with the female pronucleus. Similarly, the female pronucleus ...
  10. Prophase chromosome Prophase chromosome
    Prophase chromosome: A chromosome at the prophase stage in the cell cycle, before metaphase (when a chromosome is most highly condensed). The chromosomes in prophase are distended and often tangled like a ball of twine within the nucleus of the cell. However, when fine chromosomal details are import...
  11. Prophylactic Prophylactic
    Prophylactic: A preventive measure. The word comes from the Greek for "an advance guard," an apt term for a measure taken to fend off a disease or another unwanted consequence. A prophylactic is a medication or a treatment designed and used to prevent a disease from occurring. For example, prophylac...
  12. Prophylactic cranial irradiation Prophylactic cranial irradiation
    Prophylactic cranial irradiation: Radiation therapy to the head intended to prevent cancer from spreading (metastasizing) to the brain. ...
  13. Prophylaxis Prophylaxis
    Prophylaxis: A measure taken for the prevention of a disease or condition. For example, dental prophylaxis consists of removing plaque and cleaning the teeth to prevent cavities and gum disease. The word "prophylaxis" is from the Greek and means "an advance guard."...
  14. Propionibacterium acnes Propionibacterium acnes
    Propionibacterium acnes: A ubiquitous skin-dwelling organism that is involved in causing acne.In addition to acne, this bacterium (P. acnes) is associated with corneal ulcers, endocarditis, sarcoidosis, cholesterol gallstones, allergic alveolitis, pulmonary angiitis, and the SAPHO syndrome (of Sy...
  15. Propofol Propofol
    Propofol: a prescription sedative-hypnotic drug (brand name Diprivan) that is administered intravenously. Propofol is commonly used in the induction of general anesthesia and can be used both for the induction and maintenance of general anesthesia. When administration of the drug is discontinued,...