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Medical Dictionary Definitions A-Z List

Medical Dictionary Definitions A - Z - «P»:

  1. Plantar warts Plantar warts
    Plantar warts: Warts that grow on the soles of the feet. Plantar warts are different from most other warts. They tend to be flat and cause the buildup of callus (that has to be peeled away before the plantar wart itself can be seen. Plantar warts may attack blood vessels deep in the skin. They can...
  2. Plaque Plaque
    Plaque: 1. An semi-hardened accumulation of substances from fluids that bathe an area. Examples include dental plaque and cholesterol plaque. Minerals form dental plaque around the teeth as a result of bacterial action on food particles. Dental plaque provides an ideal environment for dental...
  3. Plaque psoriasis Plaque psoriasis
    Plaque psoriasis: The most common form of psoriasis -- about 80% of people with psoriasis have this type. Plaque psoriasis can appear on any skin surface, although the knees, elbows, scalp, trunk and nails are the most common locations. It is characterized by well-defined patches of red raised skin....
  4. Plaque, skin Plaque, skin
    Plaque, skin: A plaque is a broad, raised area on the skin. Because it is raised, it can be felt (palpated). By definition, a skin plaque has a greater surface than its elevation above the skin surface: it is broader than it is high....
  5. Plasma Plasma
    Plasma: The liquid part of the blood and lymphatic fluid, which makes up about half of its volume. Plasma is devoid of cells and, unlike serum, has not clotted. Blood plasma contains antibodies and other proteins. It is taken from donors and made into medications for a variety of blood-related c...
  6. Plasma cell Plasma cell
    Plasma cell: A type of white blood cell that produces and secretes antibodies. A plasma cell is a fully differentiated lymphocyte in the B-cell (not the T-cell) lineage. As with most cell types, plasma cells can mutate to give rise to cancer. Plasma cell malignancies include multiple myeloma, Walden...
  7. Plasma donation Plasma donation
    Plasma donation: The donation of sale of blood plasma for use in medical or other products. Unlike blood donors, most plasma "donors" in the US are paid. The procedure is done in a walk-in facility, where whole blood is taken through an IV needle, and separated into plasma and blood cells. The ...
  8. Plasma osmolarity Plasma osmolarity
    Plasma osmolarity: The osmolarity of blood plasma, which is a measure of the hydration status. The plasma osmolarity is sensitive to changes in hydration status during dehydration and rehydration. The normal plasma osmolarity is in the range of 280-300 mOs/kg. This may vary somewhat from laboratory ...
  9. Plasmacytoma Plasmacytoma
    Plasmacytoma: Cancer of the plasma cells (white blood cells that produce antibodies) that may turn into multiple myeloma....
  10. Plasmapheresis Plasmapheresis
    Plasmapheresis: A procedure designed to deplete the body of blood plasma (the liquid part of the blood) without depleting the body of its blood cells. Whole blood is removed from the body, the plasma is separated from the cells, the cells are suspended in saline, a plasma substitute or donor plasma)...
  11. Plasmid Plasmid
    Plasmid: A circle of DNA that is self-replicating (autonomously replicating) and distinct from the normal genome of bacteria. A plasmid contains genes that as a rule are not essential to the growth or survival of the cell. Some plasmids can integrate into the host genome, can be artificially constru...
  12. Plasmodium Plasmodium
    Plasmodium: The parasite guilty in the case of malaria (paludism). Plasmodium is a type of protozoa, a single-celled organism able to divide only within a host cell. The main types are: Plasmodium falciparum, the species which causes falciparum malaria, the most dangerous type of malaria; Plasmod...
  13. Plastic surgeon Plastic surgeon
    Plastic surgeon: A surgeon who specializes in reducing scarring or disfigurement that may occur as a result of accidents, birth defects, or treatment for diseases, such as melanoma. Many plastic surgeons also perform cosmetic surgery that is unrelated to medical conditions, such as rhinoplasty t...
  14. Plastic surgery Plastic surgery
    Plastic surgery: The field of surgery concerned with reducing scarring or disfigurement that may occur as a result of accidents, birth defects, or treatment for diseases, such as melanoma. Many plastic surgeons also perform cosmetic surgery that is unrelated to medical conditions, such as rhinopla...
  15. Plasticity, brain Plasticity, brain
    Plasticity, brain: See Neuroplasticity....