Category: P

  • Polycoria

    A rare congenital abnormality of the eye in which there are one or more holes in the iris in addition to the pupil. The state of having more than one pupil in one eye.  

  • Polychromasia

    The presence of certain blue red blood cells (erythrocytes) seen in blood films stained with Romanovsky stains, as well as the normal pink cells. The cells that appear blue are juvenile erythrocytes. Polychromasia, and polychromatophilia, are terms applied to an abnormal reaction of the red blood cells in severe anaemia. They have a bluish tinge…

  • Poldine

    A drug, similar to atropine, that inhibits gastric secretion and is used to treat such disorders as gastric and duodenal ulcers. It is administered by mouth; side-effects may include dry mouth, blurred vision, difficulty in urination, and fast heart beat.  

  • Poikilothermic

    Being unable to regulate the body temperature, which fluctuates according to that of the surroundings. Reptiles and amphibians are coldblooded.  

  • Poikiloderma

    A condition in which the skin atrophies and becomes pigmented, giving it a mottled appearance. A skin disorder characterized by pigmentation, telangiectasia, purpura, pruritus, and atrophy.  

  • Pleurolysis

    Surgical stripping of the parietal pleura from the chest wall to allow the lung to collapse. The procedure was used in the days before effective antituberculous drugs to help tuberculosis to heal. Loosening of parietal pleura from intrathoracic fascia to facilitate contraction of the lung or artificial pneumothorax.  

  • Plessimeter

    A small plate of bone, ivory, or other material pressed against the surface of the body and struck with a plessor in the technique of percussion.  

  • Plerocercoid

    A larval stage of certain tapeworms, such as Diphyllobothrium latum. It differs from the cysticercus (another larval form) in being solid and in lacking a cyst or bladder. The wormlike larvae of certain tapeworms, which develop in secondary hosts.  

  • Pleomastia

    Multiple breasts or nipples. These are usually symmetrically arranged along a line between the midpoint of the collar bone and the pelvis (the nipple line).  

  • Pleiotropy

    A situation in which a single gene is responsible for more than one effect in the phenotype. The mutation of such a gene will therefore have multiple effects.