| alum | <chemistry> A double sulphate formed of aluminium and some other element (especially. An alkali metal) or of aluminium. It has twenty-four molecules of water of crystallization. Common alum is the double sulphate of aluminium and potassium. It is white, transparent, very astringent, and crystallizes easily in octahedrons. The term is extended so as to include other double sulphates similar to alum in formula. Origin: OE. Alum, alom, OF. Alum, F. Alun, fr. L. Alumen alum. Source: Websters Dictionary (01 Mar 1998) |
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| alum compounds | Aluminum metal sulfate compounds used medically as astringents and for many industrial purposes. They are used in veterinary medicine for the treatment of ulcerative stomatitis, leukorrhoea, conjunctivitis, pharyngitis, metritis, and minor wounds. (12 Dec 1998) |
| alum root | <botany> A North American herb (Heuchera Americana) of the Saxifrage family, whose root has astringent properties. Source: Websters Dictionary (01 Mar 1998) |
| alum shale | <chemical> A variety of shale or clay slate, containing iron pyrites, the decomposition of which leads to the formation of alum, which often effloresces on the rock. Source: Websters Dictionary (01 Mar 1998) |
| alum stone | <chemical> A subsulphate of alumina and potash; alunite. Source: Websters Dictionary (01 Mar 1998) |
| alum-haematoxylin | A purple nuclear stain used in histology; a mixture of an aqueous solution of ammonium alum and an alcoholic solution of haematoxylin which is ripened or oxidised to haematein. (05 Mar 2000) |
| alumen | <chemistry> Alum. Origin: L. Source: Websters Dictionary (01 Mar 1998) |
| alumina | <chemistry> One of the earths, consisting of two parts of aluminium and three of oxygen, Al2O3. It is the oxide of the metal aluminium, the base of aluminous salts, a constituent of a large part of the earthy siliceous minerals, as the feldspars, micas, scapolites, etc, and the characterising ingredient of common clay, in which it exists as an impure silicate with water, resulting from the decomposition of other aluminous minerals. In its natural state, it is the mineral corundum. Origin: L. Alumen, aluminis. See Alum. Source: Websters Dictionary (01 Mar 1998) |
| aluminate | <chemistry> A compound formed from the hydrate of aluminium by the substitution of a metal for the hydrogen. Source: Websters Dictionary (01 Mar 1998) |
| aluminated | Containing alum. (05 Mar 2000) |
| aluminium | <chemistry, element> The metallic base of alumina. This metal is white, but with a bluish tinge, and is remarkable for its resistance to oxidation, and for its lightness, pertaining a specific gravity of about 2.6. Aluminium bronze or gold, a pale gold-coloured alloy of aluminium and copper, used for journal bearings, etc. Atomic weight: 27.08 Abbreviation: Al Origin: L. Alumen. See Alum. (30 Mar 1998) |
| aluminon | The ammonium salt of aurintricarboxylic acid, so-called because of its usefulness in the detection of aluminum in biologic material, foods, etc. (05 Mar 2000) |
| aluminosis | A pneumoconiosis caused by inhalation of aluminum particles into the lungs. (05 Mar 2000) |
| aluminum | <chemical> Aluminum. An extremely light, whitish, lustrous metallic element, atomic number 13, and atomic weight 26.982. Aluminum compounds are used chiefly for their antacid and astringent properties. Chemical name: Aluminum (12 Dec 1998) |
| aluminum acetate | Used as a disinfectant by embalmers; proposed as desiccant and deodorant powder for eczema and chronic skin ulcers. (05 Mar 2000) |
| burnt alum | Alum deprived of its water of crystallization by heat; an astringent dusting powder. Synonym: burnt alum. (05 Mar 2000) |
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| cake alum | Astringent detergent for skin ulcers. Synonym: cake alum. (05 Mar 2000) |
| Gomori's chrome alum haematoxylin-phloxine stain | <technique> A technique used to demonstrate cytoplasmic granules, after Bouin's or formalin-Zenker fixatives, using oxidised haematoxylin plus phloxine; in the pancreas, beta cells are blue, alpha and delta cells are red, and zymogen granules are red to unstained; in the pituitary, alpha cells are pink, beta cells and chromophobes are gray-blue, and nuclei are purple to blue. (05 Mar 2000) |
| roche alum | <chemistry> A kind of alum occuring in small fragments; so called from Rocca, in Syria, whence alum is said to have been obtained; also called rock alum. Source: Websters Dictionary (01 Mar 1998) |
| chrome alum | The sulfate of chromium and potassium; used as a mordant in histologic staining. (05 Mar 2000) |
| chrome alum haematoxylin-phloxine stain | <technique> A stain used to demonstrate pancreatic islet cells; alpha cells appear red, beta cells blue or unstained. (05 Mar 2000) |
| whey alum | An astringent and styptic preparation made by boiling alum (1 oz.) in milk (10 oz.). (05 Mar 2000) |
| potassium alum | AlK(SO4)2;an astringent and styptic; also used in veterinary medicine for ulcerative stomatitis, leukorrhoea, and conjunctivitis. Synonym: potassium alum. (05 Mar 2000) |
| dried alum | Alum deprived of its water of crystallization by heat; an astringent dusting powder. Synonym: burnt alum. (05 Mar 2000) |
| iron alum | An astringent and styptic. Synonym: ammonium ferric sulfate, ferric alum, iron alum. (05 Mar 2000) |
| Einarson's gallocyanin-chrome alum stain | <technique> A method for staining both RNA and DNA a deep blue; with proper controls, nucleic acid content of stained cells and nuclei may be estimated by cytophotometry; also useful for Nissl substance. (05 Mar 2000) |
| exsiccated alum | Alum heated to complete dryness; a local astringent. (05 Mar 2000) |
| ferric alum | An astringent and styptic. Synonym: ammonium ferric sulfate, ferric alum, iron alum. (05 Mar 2000) |