Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «X»:
Xanax: See: Alprazolam....
Xanth- (prefix): A colorful prefix relating to a yellow color. "Xanth-" is related to the word "xanthic" which has its roots in the Greek word "xanthos" which means yellow.
A number of medical terms trace to "xanthos" including, for example:
Xanthelasma: A condition in which tiny (1-2 mm) yellowish...
Xanthelasma: Tiny (1-2 mm) yellowish plaques
that are slightly raised on the skin surface of the upper or lower
eyelids. Xanthelasma is caused by tiny
deposits of fat in the skin and is often associated with abnormal
blood fat levels (hyperlipidemia). Xanthelasma is a kind of minute
Xanthine: A substance found in caffeine, theobromine, and theophylline and encountered in tea, coffee, and the colas. Chemically, xanthine is a purine.
There is a genetic disease of xanthine metabolism, xanthinuria, due to deficiency of an enzyme, xanthine dehydrogenase, needed to process xanthine ...
Xanthinuria: An inherited metabolic disorder in which there
is deficiency of an enzyme needed to process xanthine, a substance
found in caffeine, theobromine, theophylline, and related
substances. Unchecked, xanthinuria can lead to kidney stone
formation and urinary tract disease (due to xanthin...
Xanthoma: Yellowish firm
nodules in the skin frequently indicating underlying disease, such as diabetes, disorder
of fats (lipid disorder or hyperlipidemia), or other
conditions. A xanthoma is a kind of harmless growth of tissue.
Under the microscope, a xanthoma can be seen to be composed of
Xanthoma tendinosum: Xanthoma that clusters
around tendons, and is associated with lipid disorders....
Xanthoma tuberosum: Xanthoma that clusters near
joints. It is associated with lipid disorders, cirrhosis of
the liver, and thyroid disorders....
Xanthoma, diabetic: See: Eruptive xanthoma....
Xanthoma, disseminatum: A type of xanthoma
characterized by orange-to-brown nodules on the skin or
Xanthoma, eruptive: See: Eruptive xanthoma....
Xanthoma, planar: A type of xanthoma characterized by
flat yellow-to-orange patches or pimples that cluster
together on the skin....
Xanthomatosis: A condition in which fatty deposits occur in
various parts of the body. These fatty deposits are called xanthomas
or xanthomata and appear as yellowish firm nodules in the skin.
Xanthomas are in themselves a harmless growth of tissue. However,
they frequently indicate the presence...
Xanthopsia: A form of chromatopsia, a visual defect
in which objects appear as if they have been overpainted with an
unnatural color. In xanthopsia, that color is yellow....
Xanthosis: Yellowing of the skin without yellowing of the
eyes. In jaundice there is yellowing of both the skin and the
whites of the eyes. Xanthosis is associated sometimes with