| Et | <chemistry> A monatomic, hydrocarbon radical, C2H5 of the paraffin series, forming the essential radical of ethane, and of common alcohol and ether. Ethyl aldehyde. <chemistry> See Aldehyde. Origin: Ether + -yl. Source: Websters Dictionary (01 Mar 1998) |
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| eta | The seventh letter of the Greek alphabet.1. In chemistry, denotes the position seven atoms from the carboxyl group or other primary functional group. 2. Symbol for viscosity. (05 Mar 2000) |
| etaac | <zoology> The blue buck. Source: Websters Dictionary (01 Mar 1998) |
| etafedrine hydrochloride | L-N-Ethylephedrine hydrochloride;a sympathomimetic drug. (05 Mar 2000) |
| etafenone | 2'-[2-(Diethylamino)ethoxy]-3-phenylpropiophenone hydrochloride;a coronary vasodilator. (05 Mar 2000) |
| etamsylate | <chemical> 2,5-dihydroxybenzenesulfonic acid compound with diethylamine (1:1). Benzenesulfonate derivative used as a systemic haemostatic. Pharmacological action: haemostatics. Chemical name: Benzenesulfonic acid, 2,5-dihydroxy-, compd. With N-ethylethanamine (1:1) (12 Dec 1998) |
| etanidazole | <chemical> N-(2-hydroxyethyl)-2-nitro-1h-imidazole. A nitroimidazole that sensitises hypoxic tumour cells that are normally resistant to radiation therapy. Pharmacological action: antineoplastic agent, radiation-sensitizing agents. Chemical name: 1H-Imidazole-1-acetamide, N-(2-hydroxyethyl)-2-nitro- (12 Dec 1998) |
| etard reaction | <biochemistry> In organic chemistry, this involves oxidizing methylated homologs of benzene into aromatic aldehydes. The reaction uses chromyl chloride. (09 Oct 1997) |
| etat | A condition or state. Origin: Fr. State (05 Mar 2000) |
| etat crible | In neuropathology, a term describing perivascular atrophy of cerebral tissue, producing lacunae. Origin: Fr. Sieve (05 Mar 2000) |
| etat major | The staff of an army, including all officers above the rank of colonel, also, all adjutants, inspectors, quartermasters, commissaries, engineers, ordnance officers, paymasters, physicians, signal officers, judge advocates; also, the noncommissioned assistants of the above officers. Origin: F, fr. Etat state + L. Major greater. Source: Websters Dictionary (01 Mar 1998) |
| etat mamelonne | The condition of the gastric mucous membrane in chronic inflammation, when it presents numerous nodular projections. Origin: Fr. Knobby, tubercular (05 Mar 2000) |
| etazolate | <chemical> 1-ethyl-4-((1-methylethylidene)hydrazino)-1h-pyrazolo(3,4-b) pyridine-5-carboxylic acid, ethyl ester. A potent phosphodiesterase inhibitor proposed as an antipsychotic agent. Pharmacological action: antipsychotic agents, phosphodiesterase inhibitors. Chemical name: 1H-Pyrazolo(3,4-b)pyridine-5-carboxylic acid, 1-ethyl-4-((1-methylethylidene)hydrazino)-, ethyl ester (12 Dec 1998) |
| etch | 1. To produce, as figures or designs, on mental, glass, or the like, by means of lines or strokes eaten in or corroded by means of some strong acid. The plate is first covered with varnish, or some other ground capable of resisting the acid, and this is then scored or scratched with a needle, or similar instrument, so as to form the drawing; the plate is then covered with acid, which corrodes the metal in the lines thus laid bare. 2. To subject to etching; to draw upon and bite with acid, as a plate of metal. "I was etching a plate at the beginning of 1875." (Hamerton) 3. To sketch; to delineate. "There are many empty terms to be found in some learned writes, to which they had recourse to etch out their system." (Locke) Origin: D. Etsen, G. Atzen to feed, corrode, etch. MHG. Etzen, causative of ezzen to eat, G. Essen . See Eat. Source: Websters Dictionary (01 Mar 1998) |
| etching | 1. The act, art, or practice of engraving by means of acid which eats away lines or surfaces left unprotected in metal, glass, or the like. See Etch, v. T. 2. A design carried out by means of the above process; a pattern on metal, glass, etc, produced by etching. 3. An impression on paper, parchment, or other material, taken in ink from an etched plate. Etching figures, a stitch used outline embroidery. Source: Websters Dictionary (01 Mar 1998) |