| erd | The earth. <zoology> Erd shrew, the common European shrew (Sorex vulgaris); the shrewmouse. Origin: OE. Erd, eard, earth, land, country, AS. Eard; akin to OS. Ard dwelling place, OHG. Art plowing, tillage, Icel. Orth crop, and to L. Arare to plow, E. Ear to plow. Source: Websters Dictionary (01 Mar 1998) |
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| Erdheim | Jakob, Austrian physician, 1874-1937. See: Erdheim disease, Erdheim tumour. (05 Mar 2000) |
| Erdheim disease | Loss of elastic and muscle fibres in the aortic media, with accumulation of mucopolysaccharide, sometimes in cystlike spaces between the fibres; a disease of unknown cause, which may be inherited and which predisposes to dissecting aneurysms. Synonym: Erdheim disease, medionecrosis aortae idiopathica cystica, medionecrosis of the aorta, mucoid medial degeneration. (05 Mar 2000) |
| Erdheim tumour | <oncology, tumour> A form of primary brain tumour which develops in the pituitary gland. These tumours often secrete increased quantities of pituitary hormones (for example growth hormone) which can result in conditions such as gigantism and acromegaly. They are often benign and rare and comprise less than 5% of childhood brain tumours. Other symptoms include vision changes, headache and weight gain. Treatment often includes a combination of surgery and radiation therapy. (27 Sep 1997) |
| erdheim-chester disease | <radiology> Rare lipidosis, age: 50-70y, long bones invariably affected in the diaphysis and metaphysis with: patchy or diffuse increase in density, coarsened trabecular pattern, medullary sclerosis, cortical thickening (12 Dec 1998) |
| Erdmann | Hugo, German chemist, 1862-1910. See: Erdmann's reagent. (05 Mar 2000) |
| Erdmann's reagent | A mixture of sulfuric and nitric acids, used in testing alkaloids. (05 Mar 2000) |