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Dihydroxyacetone
Dihydroxyacetone Also known as DHA, the active ingredient in most sunless tanning lotions.
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DHA
Docosahexaenoic acid, an essential fatty acid, thought to be important to the development of infants, particularly as regards their eyes and brain. DHA is present in breast milk and has been added to some infant formulas. Postnatal DHA may improve vision and some cognitive functions in infants and toddlers. DHA is an omega-3, polyunsaturated, 22-carbon fatty acid. It is present in abundance in certain fish (such as tuna and bluefish) and marine animal oils.
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Dihydergot
A medicine based in dihydroergotamine and used in the treatment of orthostatic hypotension and migraine with or without aura.
Dihydroergotamine mesylate
Dihydroergotamine mesylate is a prescription or over-the-counter drug which is (or once was) approved in the United States and possibly in other countries. Active ingredient(s): dihydroergotamine mesylate.
Dihydroorotate dehydrogenase
An enzyme necessary to pyrimidine synthesis and therefore essential to the production of DNA and RNA. The drug leflunomide (Arava), an immunomodulatory agent, acts by specifically inhibiting dihydroorotate dehydrogenase.
Dihydrotestosterone
A powerful androgenic hormone formed from testosterone in peripheral target cells by the action of the enzyme, 5-reductase.
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Diffuse toxic goiter
Graves disease, the most common cause of hyperthyroidism (overactivity of the thyroid gland), with generalized diffuse overactivity ("toxicity") of the entire thyroid gland which becomes enlarged into a goiter.
DiGeorge syndrome
A genetic disorder characterized by hypocalcemia, immunodeficiency, and congenital heart disease: Hypocalcemia (low calcium levels in the blood) due to hypoplasia (underdevelopment) of the parathyroid glands that are needed to control calcium; Immunodeficiency due to hypoplasia (underdevelopment) of the thymus (an organ behind the breastbone needed for the maturation of lymphocytes into T cells); and Congenital heart disease with defects of the outflow tracts (the pulmonary artery and aorta) from the heart. Next to Down syndrome, DiGeorge syndrome is the most common genetic cause of congenital heart disease.
Digit, supernumerary
An extra finger or toe.
Digital rectal exam
An exam to detect abnormalities that can be felt (palpated) from within the rectum. The doctor inserts a lubricated, gloved finger into the rectum and feels for anything that is not normal.
Dihydroorotate dehydrogenase
An enzyme necessary to pyrimidine synthesis and therefore essential to the production of DNA and RNA. The drug leflunomide (Arava), an immunomodulatory agent, acts by specifically inhibiting dihydroorotate dehydrogenase.
Dihydroxyacetone
Dilatation and curettage
A minor operation in which the cervix is expanded enough (dilatation) to permit the cervical canal and uterine lining to be scraped with a curet (or curette), an instrument shaped like a spoon. This procedure also is called D and C.
Dilate
To stretch or enlarge. It comes from the Latin verb "dilatare" meaning "to enlarge or expand."
Dilating
The widening and opening of the cervix caused by uterine contractions.
Dilation, pupil
This examination enables your eye care professional to see more of your retina, the light-sensitive layer of tissue at the back of your eye. Dilating (widening) the pupil permits your eye to be examined for signs of disease. To do this, drops are placed into the eye to dilate (widen) the pupil. After the examination, your vision may (or may not) remain blurred for several hours.
Dilation, pupil (test)
This examination enables your eye care professional to see more of your retina, the light-sensitive layer of tissue at the back of your eye. Dilating (widening) the pupil permits the retina to be examined for signs of disease. To do this, drops are placed into the eye to dilate (widen) the pupil. After the examination, your vision may (or may not) remain blurred and you may (or may not) be bothered by the brightness of the sun for several hours. The pupil, the opening of the iris, may appear to open (dilate) and close (constrict) but it is really the iris that is the prime mover; the pupil is merely the absence of iris. The pupil determines how much light is let into the eye.
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