 Medical dictionary
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XYZ
Xanthelasmas: yellowish, fatty deposits in the eyelids.
Xanthoma: fatty skin tumour.
Xanthopsia: yellow vision.
Xerophthalmia: dry eyes.
Xerostomia: dry mouth
X-linked: a form of inheritance where the gene lies on the Xchromosome. X-linked genes can be
dominant but are usually recessive. Girls who carry an altered gene are usually
not affected since they have a second normal copy of the gene but they can pass
the affected gene on in 50 per cent of their pregnancies. Boys who have only
one X chromosome do not have a second normal copy of the gene so they will be
affected by the disorder. They will pass on the altered gene to all of their
daughters who will be carriers but to none of their sons.
X-ray: an image of a part of the body, created by sending X-rays through
the body to partially expose a photographic negative.
Zenker's Diverticulum: pouches in the oesophagus caused by increased
pressure.
Zollinger-Ellison Syndrome: a group of symptoms that occur when a tumour forms in the pancreas causing
large amounts of the hormone gastrin to be released which in turn causes too
much acid in the duodenum, resulting in ulcers, bleeding, and perforation.
Zygote: an egg which has been fertilized by a sperm but has not yet
begun cell division.
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XYZ
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