Hygiene
The science of preventive medicine and the preservation of health. Also commonly used as a euphemism for cleanliness and proper sanitation.
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- Hygiene hypothesis
— the lower incidence of allergy in those living on farms or in rural areas (due possibly to more exposure to bacteria in barns and elsewhere in the country); the lower incidence of allergy in younger children of large families with 3 or more older siblings (due perhaps to repeated exposure to infection from older […]
- Hymen
A thin membrane that may completely or partially cover the vaginal opening before first sexual intercourse but that usually disappears before puberty.
- Hyoglossus
The muscle that permits the tongue to be held on the floor of the mouth.
- Hyper-
Prefix meaning high, beyond, excessive, or above normal, as in hyperglycemia (high sugar in the blood) and hypercalcemia (high calcium in the blood). The opposite of hyper- is hypo-.
- Hyper-IgD syndrome
A genetic disorder characterized by recurring attacks of chills and fever that usually start before the first birthday and last for 4 to 6 days, usually accompanied by swollen glands in the neck and abdominal pain with vomiting or diarrhea. Other symptoms may include headache, joint pain (arthralgia), arthritis of the large joints, and reddish […]