Category: H
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Hostile work environment
Place of employment in which a reasonable person would find conditions that are abusive or intolerable. Prohibited conduct may take place repeatedly and may include physical intimidation; sexual harassment; or political, racial, religious, or sex-based discrimination.
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High-speed engine
A machine that rotates a dental instrument in excess of 12,000 rpm.
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High enema
An enema designed to reach most of the colon. A rubber tube is inserted into the rectum to carry water as far as possible.
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Hypoxic encephalopathy
The neurological damage that results from depriving the brain of oxygen or blood, or both, for several minutes. The damage may range from a transient loss of short-term memory to persistent vegetative coma. Many conditions can result in an oxygen deficiency in the brain, which is acutely dependent on oxygen, blood, and glucose to work…
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Herpetic encephalitis
Encephalitis caused by infection of the brain with herpes simplex virus- 1 (or, less often, herpes simplex virus-2). This relatively common form of encephalitis typically involves the inferior surfaces of the temporal lobes and may cause hemorrhagic necrosis of brain tissue. It is fatal in at least one third of all cases. Acyclovir (or one…
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Hemorrhagic encephalitis
Herpes encephalitis in which there is hemorrhage along with brain inflammation.
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Hereditary Elliptocytosis
An inherited condition in which the red blood cells are oval or elliptical. This anomaly occurs in about 1 in every 2000 births.
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Hydrogen electrode
An electrode that absorbs and measures hydrogen gas; used as the reference for pH measurement in research laboratories.
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High-altitude pulmonary edema
Pulmonary edema that may occur in aviators, mountain climbers, or anyone exposed to decreased atmospheric pressure.
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Hypostatic ectasia
Dilatation of a blood vessel from the pooling of blood in dependent parts, especially the legs.