XYY syndrome

XYY syndrome  /eks′dob′əlwī′/ , the phenotypic manifestation of an extra Y chromosome, which tends to have a positive effect on height and may have a negative effect on mental and psychological development. However, the anomaly also occurs in normal males. See also trisomy.

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Xysma

xysma  /zis′mə/ , membranous shreds sometimes found in the feces of patients with diarrhea.

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Xylose absorption test

xylose absorption test, a laboratory test for intestinal absorption of the monosaccharide d-xylose. Absorption of d-xylose occurs readily in the normal intestine but is diminished in patients experiencing malabsorption.

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Xylose

xylose  /zī′lōs/ , an aldopentose sugar produced by hydrolyzing straw and corn cobs. It is incompletely absorbed when taken by mouth and is used in diagnostic studies of the digestive tract.

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Xylometazoline hydrochloride

xylometazoline hydrochloride  /zī′lōmetaz′əlēn/ , an alpha-adrenergic vasoconstrictor. ▪ INDICATIONS: It is prescribed as an intranasal medication for the treatment of congestion due to colds, hay fever, sinusitis, and other upper respiratory allergies. ▪ CONTRAINDICATIONS: Glaucoma or known hypersensitivity to this drug or to sympathomimetic medications prohibits its use. It is used with caution in patients having cardiovascular disease. […]

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Xylo-

xylo-, combining form meaning “wood”: xyloketosuria, xylose, xylosuria.

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Xylitol

xylitol  /zī′litôl/ , a five-carbon sugar alcohol derived from xylose and as sweet as sucrose. Used as a noncariogenic sweetener and also as a sugar substitute in diabetic diets.

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XY

XY  /ekswī′/ , the designation for the normal sex chromosome complement in the human male. See also X chromosome, Y chromosome.

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