Medical Dictionary Definitions A-Z List
Medical Dictionary Definitions A - Z - «H»:
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Hepatosplenomegaly
Hepatosplenomegaly: Enlargement of the liver
and spleen. The word "hepatosplenomegaly" is compounded from Greek
roots: "hepato-" from "hepatikos" (of the liver) + "spleno" from
"splen" (the spleen) + "megaly" from "megas" (big or great) = bigness
of the liver and spleen.
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Hepatotoxic
Hepatotoxic: Injurious to the liver. For example, acetaminophen
(Tylenol) can be hepatotoxic. ...
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Heptad repeat
Heptad repeat: A type of tandem repeat sequence in which a group of seven aminoacids occurs many times in a protein sequence. Heptad repeats are characteristic of certain proteins such as the intermediate filament proteins....
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HER1
HER1: See: EGFR....
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HER2
HER2: Abbreviation for human epidermal growth factor receptor 2.
HER2 is expressed by, and involved in the growth of, some cancer cells. For
example, a minority of breast cancers express HER2 protein.
Also called c-erbB-2....
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Hera
Hera: In Greek mythology, a protector of women, who with her daughter Eileithyia was often called upon during childbirth....
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Herbal
Herbal: 1. An adjective, referring to herbs, as in an herbal tea.
2. A noun, usually reflecting the botanical or medicinal aspects of herbs; also a book which catalogs and illustrates herbs.
The word "herbal" was pronounced with a silent "h" on both sides of the Atlantic until the 19th century but t...
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Herbal remedy
Herbal remedy: A medication prepared from plants,
including most of the world's traditional remedies for
disease. Most people think of herbal remedies as products
sold over the counter as "supplements", such as saw
palmetto extract or goldenseal ointment. However, many over-
the-counter and pres...
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Herbalism
Herbalism: The practice of making or
prescribing herbal remedies for medical conditions.
Practitioners of herbalism may be licensed MDs,
naturopaths, or osteopaths. They may also be unlicensed.
Interested consumers should seek out knowledgeable, and
preferably licensed, herbalists....
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Herbalist
Herbalist: One versed in herbal lore and, in regard to therapy,
an herb doctor. ...
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Herbicidal
Herbicidal: Capable of controlling or destroying plants, weeds, or grasses....
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Herbicide
Herbicide: A chemical pesticide designed to control or destroy plants, weeds, or grasses. Herbicides tend to have wide-ranging effects on non-target species (other than those the pesticide is meant to control or kill)....
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Herbicide chemical 2,4-DCP
Herbicide chemical 2,4-DCP: A poisonous chemical used to produce a herbicide.
2,4-DCP (short for 2,4-dichlorophenol) is employed in the manufacture of the herbicide 2,4-D (which is short for 2,4-dichloropheoxyacetic acid).
2,4-DCP is so highly toxic that even a small amount on the skin can be leth...
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Hereditary ALS
Hereditary ALS: See: Familial ALS....
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Hereditary amyloidosis
Hereditary amyloidosis: A familial (inherited) disorder in which protein deposits (amyloid) accumulate in one or more organ systems in the body.
Hereditary amyloidosis is a relatively uncommon cause of amyloidosis. The more common forms of amyloidosis are primary an secondary amyloidosis. However, h...
