Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «D»:
Dormant tuberculosis: See: Tuberculosis, dormant. See also: Tuberculous meningitis....
Dorothy Hodgkin: See: Hodgkin, Dorothy....
Dorsal: Relating to the back or postterior of a structure. As opposed to the ventral, or front, of the structure. Some of the dorsal surfaces of the body are the back, buttocks, calves, and the knuckle side of the hand.
For a more complete listing of terms used in medicine for spatial orientation, p...
Dorsum: The back or posterior side of a structure. "Dorsum" is the Latin word for the back. Something pertaining to the dorsum is dorsal.
The dorsal surface of the hand is the back of the hand, the side opposite the palm.
The dorsal surface of the foot is the back of the foot, the side opposite the ...
Dose, absorbed: In radiology, the absorbed dose is 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....
DOTS: Stands for Directly Observed Treatment, Short-course.
DOTS is a strategy used to reduce the number of tuberculosis (TB) cases. In DOTS, healthcare workers observe patients as
they take their medicine. Left alone, many people with tuberculosis
fail to take all their medication and contribute ...
Double contrast barium enema
Double contrast barium enema: A series of x-rays of the colon and rectum taken after the patient is given an enema, followed by an injection of air. The barium outlines the intestines on the x-rays, allowing many abnormal growths to be visible. See: Barium enema....
Double helix: The structure of DNA with the two strands of DNA spiraling about one other.
The double helix looks something like an immensely long ladder twisted into a helix, or coil. The sides of the "ladder" are formed by a backbone of sugar and phosphate molecules, and the "rungs" consist of nuc...
Double pneumonia: Inflammation of both lungs. Medically called bilateral pneumonia....
Double-blind: Term used to described a study in which both the investigator or the participant are blind to (unaware of) the nature of the treatment the participant is receiving. Double-blind trials are thought to produce objective results, since the expectations of the researcher and the participan...
Double-blinded study: A study in which at
least two separate groups receive the experimental
medication or procedure at different times, with neither
group being made aware of when the experimental treatment
or procedure has been given. Double-blinded studies are
often chosen when a treatment s...
Double-jointed: Popular term to describe a joint that is unusually flexible. Medically, the joint is said to be hyperflexible, hyperextensible, or hypermobile. People whose fingers are hypermobile have higher rates of arthritis in the hands....
Double-masked: See: Double-blind....
Douche: A stream of water directed at any part of the body or any body cavity, often into the vagina, for cleansing or medicinal purposes.
A douche can be with a simple solution of vinegar in water. Some commercial douche solutions have somewhat more romantic names than vinegar (names such as Coun...
Douching: Using water or a medicated solution to clean the vagina. Vaginal douching has been done for many, many years. However, there is currently concern that it may sometimes cause problems. It may mask, or even worsen, conditions such as bacterial or yeast infection of the vagina. Even more seri...