Medical terms - Letter X
65 terms start with the letter X.
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XP
Xeroderma pigmentosum
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XRT
Medical abbreviation for radiotherapy
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XTC
A street name for 3-4 methylenedioxymethamphetamine. See: Ecstasy
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Xuezhikang
One of the three major preparations of red yeast rice, a tradition Chinese medicine now used to lower cholesterol
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XX
The sex chromosome complement of a normal human female. See also X chromosome
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XX gonadal dysgenesis with sensorineural deafness
See Perrault syndrome
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XX male syndrome
A syndrome characterized by the presence of an XX sex chromosome complement in an individual with male genitalia including both testes but no sperm production (azoospermia). Babies with the XX male syndrome may come to…
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XXX syndrome
A chromosome condition present in 1 in 1000 females, due to the presence of three X chromosomes rather than the usual two. The condition is associated with increased height but no malformations. Intelligence ranges from…
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XXXX syndrome
A chromosome disorder in females caused by the presence of four X chromosomes rather than the usual two. The disorder is characterized by decreased intelligence (IQ 30 to 80; average 55), speech and behavioral problems…
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XXXXX syndrome
A chromosome disorder in females, caused by the presence of five X chromosomes rather than the usual two. It is characterized by decreased intelligence (IQ 20 to 75) and multiple malformations including upward-slanting…
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XXY
See: Klinefelter syndrome
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XY
The most frequent sex chromosome complement in human males
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Xylitol
Xylitol: A sweetener found in plants that is used as a substitute for sugar. Xylitol is considered a nutritive sweetener because it provides calories, just like sugar. (Saccharin is an example of a nonnutritive…
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XYY
An extra Y chromosome in a male. See: XYY syndrome
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XYY syndrome
A chromosomal disorder that affects males only, caused by the presence of an extra Y chromosome. Symptoms may include increased height, speech delays, learning disabilities, mild to moderate mental retardation, and…