Dictionary

herbalism The practice of making or prescribing herbal remedies for medical conditions. Practitioners of herbalism may be licensed or unlicensed. See also herbalist.

herbalist One versed in herbal lore and, in regard to therapy, an herb physician. Herbalists may be licensed MDs, naturopaths, or osteopaths. They may also be unlicensed. People who are interested in herbalism should seek out knowledgeable, and preferably licensed, herbalists. See also herbalism.

Herceptin Brand name of the drug trastuzumab, a type of targeted cancer therapy known as a monoclonal antibody, for women with breast cancer whose tumors produce too much HER2 protein. This type of cancer is known as “HER2-positive.” See also HER2.

hereditary angioneurotic edema See angioedema, hereditary.

hereditary hemorrhagic telangiectasia A genetic disease characterized by the presence of multiple direct connections between arteries and veins called arteriovenous malformations (AVMs). Small AVMs, or telangiectases, close to the surface of skin and mucous membranes often rupture and bleed after slight trauma. Abbreviated HHT. The most common manifestations of HHT are recurrent nosebleeds beginning at…

hereditary multiple exostoses See osteochondromatosis.

hereditary mutation A gene change that occurs in a germ cell (an egg or a sperm) and is then incorporated into every cell in the developing body of the new organism. Hereditary mutations play a role in cancer, as, for example, in the eye tumor retinoblastoma and Wilms’ tumor of the kidney. Also known as…

hereditary spherocytosis See spherocytosis, hereditary.

heredity The genetic transmission of characteristics from parent to child.

heritability The degree to which something is inherited.

heritable Capable of being transmitted from parent to child.

Hermansky-Pudlak syndrome A group of genetic diseases characterized by a deficiency of pigment in the skin and eye, a bleeding tendency resulting from a platelet storage pool deficiency, and systemic disorders related to deficient function of lysosomes. Abbreviated HPS. Albinism that occurs in the eyes results in significant reduction in visual acuity. Pulmonary fibrosis and…