Medical Glossary Index:


X

Xanthelasma- fatty deposits around the eyes that are common in elderly people and are associated with high levels of cholesterol in the blood

Xanthine- a bronchodilator drug that is used to treat asthma

Xanthomatosis- a condition in which fatty deposits occur in various parts of the body, possibly leading to atherosclerosis

X chromosome- one of the two sex chromosomes; determines female sex characteristics

Xeroderma pigmentosum- a genetic disorder in which the skin is extremely sensitive to sunlight, causing it to age prematurely and leaving the individual particularly susceptible to skin cancer

Xerophthalmia- excessive dryness of the cornea and conjunctiva due to a lack
of vitamin A

X-linked disorder- a genetic disorder in which the abnormal gene is located on the X chromosome; those affected are almost always men

X-ray- see Radiography

XYY syndrome- a disorder in which a man has an extra Y chromosome, causing him to be unusually tall and to have behavioral disorders