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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. p arm of a chromosome p arm of a chromosome
    p arm of a chromosome: The short arm of a chromosome. The "p" comes from the French "petit" meaning small. All human chromosomes have 2 arms - the p (short) arm and the q (long) arm - that are separated from each other only by a primary constriction, the centromere, the point at which the chrom...
  2. p in biochemistry p in biochemistry
    p in biochemistry: The abbreviation for protein. For example, p53 is a protein (53 kilodaltons in size). ...
  3. p in population genetics p in population genetics
    p in population genetics: The frequency of the more common of two different alternative (allelic) versions of a gene. (The frequency of less common allele is q). ...
  4. P. acnes P. acnes
    P. acnes: See: Propionibacterium acnes....
  5. P. cepacia P. cepacia
    P. cepacia: Pseudomonas cepacia, a bacterium now known as Burkholderia cepacia. See: Burkholderia cepacia....
  6. p.c. p.c.
    p.c.: Abbreviation meaning after meals (from the Latin "post cibum", after meals). One of a number of hallowed abbreviations of Latin terms that have traditionally been used in prescriptions. Some others: a.c. = before meals (from "ante cibum", before meals) b.i.d. = twice a day (from "bis in di...
  7. p.o. p.o.
    p.o.: Abbreviation meaning by mouth, orally (from the Latin "per os", by mouth). One of a number of hallowed abbreviations of Latin terms that have traditionally been used in prescriptions. Some others: a.c. = before meals (from "ante cibum", before meals) b.i.d. = twice a day (from "bis in die",...
  8. p.r.n. p.r.n.
    p.r.n.: Abbreviation meaning "when necessary" (from the Latin "pro re nata", for an occasion that has arisen, as circumstances require, as needed). One of a number of hallowed abbreviations of Latin terms that have traditionally been used in prescriptions. Some others: a.c. = before meals (from "a...
  9. p53 p53
    p53: A tumor suppressor. The designation "p53" stands for "protein 53 kilodaltons" in size. p53 is a specific protein produced by a gene that functions to suppress the growth of tumors. The p53 gene is the most commonly mutated gene known in human cancer. Like other tumor-suppressor genes, p53 no...
  10. PA (physician assistant) PA (physician assistant)
    PA (physician assistant): A physician assistant (PA) is a mid-level medical practitioner who works under the supervision of a licensed doctor (an MD) or osteopathic physician (a DO). The physician assistant came about in the 1960s as a response to the need for more clinicians (there was a shortage...
  11. PA (posteroanterior) PA (posteroanterior)
    PA (posteroanterior): In anatomy, PA stands for posteroanterior: from back-to-front. For example, a PA X-ray of the chest is taken from back-to-front. PA in this respect is the opposite of AP which stands for anteroposterior: from front-to-back. ...
  12. PA X-ray PA X-ray
    PA X-ray: An X-ray picture in which the beams pass from back-to-front (posteroanterior). As opposed to an AP (anteroposterior) film in which the rays pass through the body from front-to-back....
  13. PA-C PA-C
    PA-C: Physician Assistant - Certified....
  14. Pacemaker Pacemaker
    Pacemaker: A system that sends electrical impulses to the heart in order to set the heart rhythm. The pacemaker can be the normal "natural" pacemaker of the heart or it can be an electronic device. The natural pacemaker of the heart is the sinus node, one of the major elements in the cardiac cond...
  15. Pacemaker, artificial Pacemaker, artificial
    Pacemaker, artificial: A device that uses electrical impulses to regulate the heart rhythm or to reproduce that rhythm. An internal pacemaker is one in which the electrodes into the heart, the electronic circuitry and the power supply are implanted (internally) within the body. Although there are di...