| carbon dioxide snow | Solid carbon dioxide used in the treatment of warts, lupus, nevi, and other skin affections, and as a refrigerant. Synonym: dry ice. (05 Mar 2000) |
|---|---|
| snow | 1. Watery particles congealed into white or transparent crystals or flakes in the air, and falling to the earth, exhibiting a great variety of very beautiful and perfect forms. Snow is often used to form compounds, most of which are of obvious meaning; as, snow-capped, snow-clad, snow-cold, snow-crowned, snow-crust, snow-fed, snow-haired, snowlike, snow-mantled, snow-nodding, snow-wrought, and the like. 2. Something white like snow, as the white colour (argent) in heraldry; something which falls in, or as in, flakes. "The field of snow with eagle of black therein." (Chaucer) Red snow. See Red. Snow bunting. <zoology> A small black leaping poduran (Achorutes nivicola) often found in winter on the snow in vast numbers. Snow flood, a flood from melted snow. <botany> Snow flower, a fleshy parasitic herb (Sarcodes sanguinea) growing in the coniferous forests of California. It is all of a bright red colour, and is fabled to grow from the snow, through which it sometimes shoots up. Origin: OE. Snow, snaw, AS. Snaw; akin to D. Sneeuw, OS. & OHG. Sneo, G. Schnee, Icel. Snaer, snjor, snajar, Sw. Sno, Dan. Snee, Goth. Snaiws, Lith. Snegas, Russ. Snieg', Ir. & Gael. Sneachd, W. Nyf, L. Nix, nivis, Gr. Acc. Nifa, also AS. Sniwan to snow, G. Schneien, OHG. Sniwan, Lith. Snigti, L. Ningit it snows, Gr. Nifei, Zend snizh to snow; cf. Skr. Snih to be wet or sticky. Source: Websters Dictionary (01 Mar 1998) |
| snow blindness | <ophthalmology> Severe photophobia that occurs secondary to ultraviolet light induced keratoconjunctivitis. (27 Sep 1997) |
| snow conjunctivitis | Acute keratoconjunctivitis resulting from exposure to intense ultraviolet irradiation. Synonym: actinic conjunctivitis, arc-flash conjunctivitis, flash keratoconjunctivitis, ophthalmia nivalis, snow conjunctivitis, welder's conjunctivitis. (05 Mar 2000) |
| Snow procedure | Augmentation of the bladder by incision and excision of detrusor muscle leaving only bladder epithelium. Synonym: autocystoplasty, Snow procedure. (05 Mar 2000) |
| Rambourg's chromic acid-phosphotungstic acid stain | <technique> A stain for glycoproteins, used with an electron microscope, with which ultrathin tissue sections reveal complex carbohydrates in the same locations as shown by Rambourg's periodic acid-chromic methenamine-silver stain. (05 Mar 2000) |
| a1-acid glycoprotein | <biology> Plasma protein of mammals and birds, 38% carbohydrate. In humans a single chain glycoprotein of 39 kD. Increased levels are associated with inflammation, pregnancy and various diseases. (18 Nov 1997) |
| abscisic acid | <biochemistry> A lipid hormone that inhibits cell growth in plants, it is associated with fruit drop, leaf death and seed dormancy. It is synthesised in the plastids from carotenoids. This hormone helps plants deal with water loss, and its effects can be reversed with gibberellins. (06 May 1997) |
| abscisic acid 8'-hydroxylase | <enzyme> Catalyses conversion of abscisic acid to 8'-hydroxyabscisic acid, which rearranges to phaseic acid Registry number: EC 1.14.99.- Synonym: aba 8'-hydroxylase (26 Jun 1999) |
| acetic acid | <chemical> The acid most commonly associated with vinegar, it is the most commercially important organic acid and is used to manufacture a wide range of chemical products, such as plastics and Acetobacter but, except for making vinegar, is usually made through synthetic processes. Derivatives of acetic acid which may be formed by substitution reactions. Mono- and di-substituted, as well as, halogenated compounds have been synthesised. Experimentally, alpha- and n2- substituted acetic acids have been examined for their anti-inflammatory activity and effect on the central nervous system respectively. Additionally, limited exposure data has been collected on dibromo and dichloroacetic acids to determine whether they pose health effects. Synonym: ethanoic acid. (26 Jun 1999) |
| acetoacetic acid | CH3COCH2COOH;one of the ketone bodies, formed in excess and appearing in the urine in starvation or diabetes. Synonym: diacetic acid. (05 Mar 2000) |
| acetohydroxamic acid | C2H5NO2; N-Hydroxyacetamide;an inhibitor of urease, used as adjunctive therapy in chronic urea-splitting urinary infections. (05 Mar 2000) |
| acetrizoic acid | <chemical> A water-soluble, iodinated radiographic contrast medium, used as sodium acetrizoate in hysterosalpingography. Pharmacological action: contrast media. Chemical name: Benzoic acid, 3-(acetylamino)-2,4,6-triiodo- (12 Dec 1998) |
| acetylsalicylic acid | <drug> An odourless, white, slightly bitter drug used to reduce pain, fever, inflammation and sometimes to prevent blood clotting. Also called aspirin. Some people cannot tolerate it because it can cause stomach bleeding, however. It is soluble in both water and alcoholand melts at 132 to 136 degrees C. (06 May 1997) |
| acetyltannic acid | An astringent used for treatment of diarrhoea. Synonym: diacetyltannic acid, tannylacetate. (05 Mar 2000) |