Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «A»:
Abscission: To remove tissue by cutting it
away, as in surgery....
Abse: See: Abse, Dannie....
Abse, Dannie: British pulmonary physician and poet. Abse was born in 1923 in Cardiff, Wales to a Jewish family. He studied medicine first in Wales and then at King's College, London. He published his first collection of poetry in 1948 and qualified as a physician in 1950. Since then he has continue...
Absence of the breast
Absence of the breast: A rare condition wherein the normal growth of the breast or nipple never takes place. They are congenitally absent. There is no sign whatsoever of the breast tissue, areola or nipple. There is nothing there.
Absence of the breast, also called amastia, is frequently not an isol...
Absence of the nipple
Absence of the nipple: Medically called athelia, this is a rare condition but it is common in certain conditions. Athelia tends to occurs on one side (unilaterally) in children with the Poland sequence and on both sides (bilaterally) in certain types of ectodermal dysplasia.
The Poland sequence (...
Absence seizure: A seizure that takes the form
of a staring spell. The person suddenly seems to
be "absent." An absence seizure involves a brief loss of awareness, which can be accompanied by blinking or mouth twitching. Absence seizures have a very characteristic appearance on an electroencephalo...
Absent eye: Also called anophthalmia, a congenital malformation (birth defect) of the globe.
Anophthalmia refers, strictly speaking, to absence of the globe and ocular tissue from the orbit. However, in most cases of anophthalmia, CT scans show some remnants of the globe, indicating they represent s...
Absenteeism: The frequent absence from work or other duty without good reason. See also: Presenteeism....
Absinthe: Once a major
medical hazard, absinthe is an emerald-green liqueur flavored with extracts of the wormwood plant, licorice and aromatic flavorings in a alcohol base. Absinthe was manufactured, commercialized and popularized in France in the late 1700s by Henri-Louis Pernod. It became an ex...
Absinthism: The disorder associated with the habitual abuse of absinthe. The symptoms included hallucinations, sleeplessness, tremors, and convulsions. There has been debate over whether absinthism was due to absinthe or the alcohol contained therein. For more information, see: Absinthe....
Absolute CD4 count
Absolute CD4 count: The number of "helper" CD4 T-lymphocytes in a cubic millimeter of blood. With HIV, the absolute CD4 count declines as the infection progresses. The absolute CD4 count is frequently used to monitor the extent of immune suppression in persons with HIV. Also called a T4 count....
Absolute neutrophil count
Absolute neutrophil count: The real number of white blood cells (WBCs) that are neutrophils. The absolute neutrophil count is commonly called the ANC.
The ANC is not measured directly. It is derived by multiplying the WBC count times the percent of neutrophils in the differential WBC count. The per...
Absorb: 1. To take something in, as through the skin or the intestine.
2. To react with radiation and reduce it in intensity, as with a dose of radiation or transmitted light.
See also: Absorbed dose; Absorption; Malabsorption; Reabsorption.
Absorbed dose: In radiology, the amount of energy that is deposited in any material by ionizing radiation. The unit of absorbed dose, the rad, is a measure of energy absorbed per gram of material. An alternative unit of absorbed dose is the gray. One gray equals 100 rads....
Absorption: Uptake. In the biomedical sciences, absorption has diverse specific meanings.
In the body, absorption is the process whereby a cell, tissue or organ takes up a substance.
In the intestinal tract, absorption is the uptake of food (or other substances) from the digestive tract.