Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «P»:
Proctitis, ulcerative: Ulcerative colitis that is limited
to the rectum. Ulcerative colitis itself is a relatively common
disease involving inflammation of the large intestine (the colon).
The cause is unknown. It is a form of inflammatory bowel disease and
has some similarity to a related disor...
Proctocele: See: Rectocele....
Proctology: A medical specialty that deals with
disorders of the rectum and anus....
Proctosigmoidoscopy: See: Sigmoidoscopy....
Prodrug: A precursor (forerunner) of a drug. A prodrug must undergo chemical conversion by metabolic processes before becoming an active pharmacological agent. For example, sulfasalazine is a prodrug. It is not active in its ingested form. It has to be broken down by bacteria in the colon into two p...
Product, gene: The RNA or protein that results from the
expression of a gene. The amount of gene product is a measure of the degree of gene
Progeny: The children and other descendants. For example one might say that the progeny of someone with a genetic (inherited) condition such as Huntington disease are themselves at risk for the disease.
The word "progeny" is the progeny of the Latin verb "progignere " meaning "to beget."...
Progeria: A rare genetic disorder that causes children to age prematurely. The classic type of childhood progeria is Hutchinson-Gilford syndrome, which is commonly referred to as progeria. It is characterized by dwarfism, baldness, pinched nose, small face and small jaw relative to the head size, de...
Progestational hormone: A synonym for the hormone progesterone. See: Progesterone....
Progesterone: A female hormone and the principal
progestational hormone that is made mainly by the corpus luteum in the ovary and by the placenta. Progesterone prepares the lining (endometrium) of the uterus (the womb) to receive and sustain the fertilized egg and so permits pregnancy. Similarly ref...
Progesterone receptor test
Progesterone receptor test: A laboratory test to determine if breast cancer
cells have progesterone receptors on their surface. If the cells have
progesterone receptors, they may depend on progesterone for growth and will
usually respond to hormonal therapy. Breast cancer cells that do not have ...
Progestin: Any one of a group of steroid hormones that have the effect of progesterone....
Prognathism: An overly prominent jaw. ...
Prognosis: 1. The expected course of a disease.
2. The patient's chance of recovery.
The prognosis predicts the outcome of a disease and therefore the future for the patient. His prognosis is grim, for example, while hers is good.
The word prognosis comes from the Greek prognostikos (of knowledge ...
Prognostic: 1. (adjective) In medicine, relating to the prognosis of a disease. For example, a favorable prognostic factor.
2. (adjective) Generally, relating to a prediction. For example, a prognostic index for the economy.
3. (noun) In medicine, an indicator of the course of a disease.