Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Pollen count: The number of pollen grains landing on a given area during a specified time. The count is taken by a spinning rod that moves through the air at certain intervals. The pollen grains that stick to the rod are specially stained and examined through the microscope.
Technically, pollen gra...
Pollenosis: See: Pollinosis....
Pollex: The thumb. Pollex is derived from the Latin pollere, to be strong, because in a contest of strength the thumb wins over the other fingers. Plural: pollices.
The Romans used pollex for both the thumb and the big toe. In anatomy, the thumb is the pollex while the big toe is called the hallux....
Pollices: The thumbs. The plural of pollex. See: Pollex....
Pollinosis: 1. Hay fever in response to pollen. 2. Hay fever in response to any allergen.
See: Hay fever....
Polonies: See: Polony....
Polony: A tiny colony of DNA, about one micron in diameter. The word "polony" is a contraction of "polymerase colony." To create polonies, a solution containing dispersed DNA fragments is poured onto a microscope slide. An enzyme called DNA polymerase is added. It causes each fragment to copy itsel...
Poly-: 1) Prefix meaning much or many For example,
polycystic means characterized by many cysts. 2) Short form for
polymorphonuclear leukocyte, a type of white blood cell....
Poly1 isomerase: An enzyme also known as Pin1. See: Pin1....
Polyarteritis nodosa: An autoimmune disease (immune system
attacking its own body) characterized by spontaneous inflammation of the arteries
(arteritis) of the body. Because arteries are involved, the disease can affect any organ
of the body, most commonly muscles, joints, intestines, nerves, kidney...
Polyarticular: Involving many joints. As opposed to
monoarticular (affecting just one joint). From the Latin "articulus," meaning a
Polycentric: Having two or more centers. Polycentric disease is usually referred to as multicentric disease. See also: Multifocal....
Polychlorinated biphenyls: See: PCBs....
Polychlorocamphene: See: Toxaphene....
Polyclonal: Derived from different cells. As opposed to monoclonal....