Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Polygenic disease: A genetic disease caused by the combined actions of two or more genes. Examples of
polygenic diseases include coronary heart disease, diabetes, hypertension, and peptic ulcers. Because such disorders depend on the simultaneous presence of several genes, they are not inherited in...
Polyglandular autoimmune syndrome (PGA)
Polyglandular autoimmune syndrome (PGA): A genetic autoimmune disease with an extraordinary array of clinical features but characterized most often by at least 2 of the following 3 findings: hypoparathyroidism -- underfunction of the parathyroid glands which control calcium,
candidiasis (yeast infe...
Polyhydramnios: Too much amniotic fluid. ...
Polymerase chain reaction (PCR)
Polymerase chain reaction: See PCR....
Polymerase, DNA: Enzyme that catalyzes (speeds) the
polymerization of DNA. DNA polymerase uses preexisting nucleic acid templates and
assembles the DNA from deoxyribonucleotides....
Polymerase, RNA: Enzyme that catalyzes (speeds) the
polymerization of RNA. RNA polymerase uses preexisting nucleic acid templates and
assembles the RNA from ribonucleotides. ...
Polymorphic: Pertaining to a polymorphism,
a variation in the DNA that is too common to be due merely to new mutation. A polymorphism must have a frequency of at least 1% in the population.
Examples of polymorphic genes include those for sickle cell disease, thalassemia and G6PD deficiency. These g...
Polymorphic light eruption
Polymorphic light eruption:
Polymorphic light eruption is a common skin reaction to sunlight that occurs most commonly in people with fair skin. Polymorphic light eruption results in small red raised
spots and blisters on the skin within four days after exposure to ultraviolet radiation, such as f...
Polymorphism: A variation in the DNA that is too common to be due merely to new mutation. A polymorphism must have a frequency of at least 1% in the population.
Examples of polymorphisms include the genes for sickle cell disease, thalassemia and G6PD deficiency. These genes are widely believed to of...
Polymorphonuclear leukocyte: A type of white blood cell with a
nucleus that is so deeply lobated or divided that the cell looks to have multiple nuclei.
Informally called a poly. ...
Polymox: See: Amoxicillin....
Polymyalgia: Pain in multiple muscles, as in polymyalgia rheumatica....
Polymyalgia rheumatica (PMR)
Polymyalgia rheumatica (PMR): A disorder of the muscles and
joints of older persons characterized by pain and stiffness, affecting both sides of the
body, and involving the shoulders, arms, neck, and buttock areas. ...
Polymyositis: A chronic inflammatory disease of muscle that begins when white blood cells, the immune cells of inflammation, spontaneously invade muscles, especially the muscles closest to the trunk or torso, resulting in sometimes severe muscle pain, tenderness and weakness.
There are commonly per...
Polyneuritis, acute idiopathic
Polyneuritis, acute idiopathic: Also known as the Guillain-Barre syndrome, a disorder characterized by progressive symmetrical paralysis and loss of reflexes usually beginning in the legs with, in most cases, nearly complete or complete recovery.
The Guillain-Barre syndrome is not associated with f...