| Xenopsylla cheopis |
The rat flea; other hosts include humans. This species is a vector for a number of pathogens including Hymenolepis nana, the dwarf tapeworm; Salmonella organisms; the causative organisms of bubonic and sylvatic p
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| xenorexia |
An abnormality of appetite marked by persistent swallowing of foreign objects. SEE: pica.
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| xerocheilia |
Dryness of the lips; a type of cheilitis.
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| xerocyte |
An erythrocyte that is dehydrated and appears to have “puddled” at one end, seeming half dark and half light. This type of cell is found in hereditary xerocytosis. SEE: illus. ; xerocytosis,
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| xerocytosis, hereditary |
A disorder of erythrocytes usually inherited as an autosomal dominant trait. A membrane defect in the red blood cells permits the loss of excess potassium ions and water, causing dehydration of the cells. Hemolysis and an
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