| halation | 1. <optics> Blurring of the visual image by glare. 2. <photography> An appearance as of a halo of light, surround the edges of dark object in a photographic picture. (21 Jun 2000) |
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| halazepam | <drug> A benzodiazepine used in the management of anxiety disorders and for short-term relief of symptoms of anxiety. Chemical name: 7-Chloro-1,3-dihydro-5-phenyl-1-(2,2,2-trifluoroethyl)-2H-1,4-benzodiazepin-2-one (21 Jun 2000) |
| halazone | <drug> A chloramine used for the sterilization of drinking water. Chemical name: N,N-(N,N-Dichlorosulfamyl)benzoic acid (21 Jun 2000) |
| Halbeisen, William | <person> U.S. Physician, *1915. See: Stryker-Halbeisen syndrome. (05 Mar 2000) |
| Halberstaedter, Ludwig | <person> German physician, 1876-1949. See: Halberstaedter-Prowazek bodies. (05 Mar 2000) |
| Halberstaedter-Prowazek bodies | Distinctive, complex, intracytoplasmic forms found in the conjunctival epithelial cells of persons in the acute phase of trachoma, less frequently in later stages, varying from 1) discrete acidophilic granules (approximately 250 nm in diameter), to 2) irregular clumps of such material embedded in a basophilic matrix, to 3) relatively large basophilic body's (approximately 700 to 1000 nm in diameter), to 4) large basophilic body's that include discrete, tiny, acidophilic granules. Synonym: Halberstaedter-Prowazek bodies, Prowazek-Greeff bodies. (05 Mar 2000) |
| halcinonide | <chemical> 21-chloro-9-fluoro-11-hydroxy-16,17-((1-methylethylidene)bis(oxy)pregn-4-ene-3,20-dione. A topical glucocorticoid used in the treatment of dermatitis, eczema, or psoriasis. It may cause skin irritation. Pharmacological action: glucocorticoids, topical. Chemical name: Pregn-4-ene-3,20-dione, 21-chloro-9-fluoro-11-hydroxy-16,17-((1-methylethylidene)bis(oxy))-, (11beta,16alpha)- (12 Dec 1998) |
| halcyon | <ornithology> A kingfisher. By modern ornithologists restricted to a genus including a limited number of species having omnivorous habits, as the sacred kingfisher (Halcyon sancta) of Australia. "Amidst our arms as quiet you shall be As halcyons brooding on a winter sea." (Dryden) Origin: L. Halcyon, alcyon, Gr., F. Halcyon. Source: Websters Dictionary (01 Mar 1998) |
| halcyonold | <zoology> See Alcyonoid. Origin: Halcyon. Source: Websters Dictionary (01 Mar 1998) |
| Haldane chamber | An obsolete chamber for metabolic studies on animals. (05 Mar 2000) |
| Haldane effect | The promotion of carbon dioxide dissociation by oxygenation of haemoglobin. (05 Mar 2000) |
| Haldane relationship | <biochemistry> A mathematical relationship between the equilibrium constant of an enzyme-catalyzed reaction and all of that enzyme's kinetic parameters (e.g., Vmax and Km's). (05 Mar 2000) |
| Haldane transformation | The multiplication of inspired oxygen concentration by the ratio of expired to inspired nitrogen concentrations in the calculation of oxygen consumption or respiratory quotient by the open circuit method. (05 Mar 2000) |
| Haldane tube | A tube for securing human alveolar air samples; consisting of a narrow hosepipe with a mouthpiece from which a tube is attached for the withdrawal of expired air at the end of a sudden, maximal expiration. (05 Mar 2000) |
| Haldane's apparatus | <apparatus, chest medicine> A device used for the analysis of respiratory gases. (05 Mar 2000) |
| Anger, Hal | <person> U.S. Electrical engineer, *1920. See: Anger camera. (05 Mar 2000) |
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