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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. Paraquat lung Paraquat lung
    Paraquat lung: Lung disease caused by the contact herbicide paraquat which selectively accumulates in the lungs and is highly toxic. Once X-ray changes from paraquat are evident in the lungs, death is virtually certain. Paraquat lung emerged as a health concern in the 1970s, when the US government...
  2. Parasite Parasite
    Parasite: An organism that lives in or on and takes its nourishment from another organism. A parasite cannot live independently. Parasitic diseases include infections by protozoa, helminths, and arthropods: Protozoa -- Malaria is caused by plasmodium, a protozoa, a single-cell organism that can on...
  3. Parasitemia Parasitemia
    Parasitemia: The presence of a parasite in the blood. For example, malarial parasitemia. Parasitemia is analogous to bacteremia (the presence of bacteria in the blood) and viremia (the presence of a virus in the blood). Parasitemia, bacteremia and viremia are all forms of sepsis (bloodstream infect...
  4. Parasitic Parasitic
    Parasitic: Having to do with a parasite, as in a parasitic infection; or acting like a parasite by taking nourishment from another....
  5. Parasitic worm Parasitic worm
    Parasitic worm: A worm classified as a parasite. (A parasite is a disease-causing organism that lives on or in a human or another animal and derives its nourishment from its host.) Lice are examples of parasites that live on humans; bacteria and viruses are examples of parasites that live either...
  6. Parasitosis Parasitosis
    Parasitosis: Infestation or infection with parasites. See also: Delusional parasitosis....
  7. Paraskevidekatriaphobia Paraskevidekatriaphobia
    Paraskevidekatriaphobia: Fear of Friday the 13th. The word "paraskevidekatriaphobia" was devised by Dr. Donald Dossey who told his patients that "when you learn to pronounce it, you're cured!"...
  8. Parasomnia Parasomnia
    Parasomnia: A sleep disorder in which odd or dangerous events occur that intrude on sleep. The parasomnias include sleep talking, sleepwalking (somnambulism), sleep terrors, REM behavior disorder, and nocturnal dissociative disorder. Sleep talking may range from a word or two to an entire speech of...
  9. Parasplenic Parasplenic
    Parasplenic: Located near or alongside of the spleen. The spleen is an organ located in the upper left part of the abdomen near the stomach. The spleen produces lymphocytes, filters blood, serves as a major reservoir for blood and destroys blood cells that are aged. The prefix "para-" comes straigh...
  10. Parasuicide Parasuicide
    Parasuicide: An apparent attempt at suicide, commonly called a suicidal gesture, in which the aim is not death. For example, a sublethal drug overdose or wrist slash. Previous parasuicide is a predictor of suicide. The increased risk of subsequent suicide persists without decline for at least two de...
  11. Parasympathetic nervous system Parasympathetic nervous system
    Parasympathetic nervous system: A part of nervous system that serves to slow the heart rate, increase the intestinal and gland activity, and relax the sphincter muscles. The parasympathetic nervous system, together with the sympathetic nervous system (that accelerates the heart rate, constricts bloo...
  12. Parathormone Parathormone
    Parathormone: A hormone that is made by the parathyroid gland and that is critical to calcium and phosphorus balance. Deficiency of parathormone results in abnormally low calcium levels in the blood (hypocalcemia). Excessive parathormone leads to elevated calcium levels in the blood (hypercalcemia) ...
  13. Parathyrin Parathyrin
    Parathyrin: See: Parathormone....
  14. Parathyroid adenoma Parathyroid adenoma
    Parathyroid adenoma: A small tumor of the parathyroid gland and the most common disorder of the gland. Parathyroid adenomas are benign (NOT malignant). The gland increases in size and produces PTH in excess. This is called primary hyperparathyroidism. In most cases, patients are unaware of the tu...
  15. Parathyroid gland Parathyroid gland
    Parathyroid gland: A gland that regulates calcium, located behind the thyroid gland in the neck. The parathyroid gland secretes a hormone called parathormone (or parathyrin) that is critical to calcium and phosphorus metabolism. Although the number of parathyroid glands can vary, most people have fo...