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zygote
A fertilized ovum (egg).
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zoster
A viral infection of certain sensory nerves that causes pain and an eruption of blisters on the skin along the…
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zoonosis
A disease that can be spread to people by animals.
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yellow fever
An acute viral illness spread by mosquito bites. Characterized by fever and jaundice.
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yeast
A single-celled fungus that reproduces by budding and may lead to infections of the skin or other moist areas.
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xeroderma
Dryness of the skin.
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xenograft
Transplantation of tissue or organs from an individual of one species to another unrelated species, such as a pig’s heart…
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xanthoma
A tumor-like deposit of fatty substances in the skin.
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xanthelasma
Fatty deposits that appear as yellowish patches, or plaques, under the skin, often appearing in or near the eyelids.
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wrist
The joint or part of the arm between the hand and the forearm.
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withdrawal
The act or process of giving up the use of a drug to which one has become addicted or…
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Wilson's disease
A rare, inherited disorder that occurs when copper pools in the red blood cells. May cause tremors, muscle rigidity, speech…
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Wilms' tumor
A rapidly growing tumor of the kidney found in children.
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whooping cough
A serious infectious respiratory disease of children. Named for the distinctive whooping sound made by the patient after a coughing…
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whiplash
An injury of the neck or spine due to a sudden, severe bending of the neck.
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wheeze
A whistling or squeaky breathing sound caused by the narrowing (constriction) or blocking of the airway.
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wheal
A pimple or small itchy elevation of the skin caused by an allergen.
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wart
A small, hard, abnormal growth of the skin or mucous membranes caused by a virus.
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vulva
The external parts of the female reproductive tract surrounding the opening to the vagina.
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vomiting
Ejecting the contents of the stomach through the mouth.
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vitreous humor
The jelly-like material that fills the eyeball between the lens and retina.