| As | arsenic; astigmatism; asymptomatic |
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| As | Arsenic |
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| As2O3 | Arsenic Trioxide |
| ASi | arsenic |
| arsenic | 1. <chemistry> One of the elements, a solid substance resembling a metal in its physical properties, but in its chemical relations ranking with the nonmetals. It is of a steel-gray colour and brilliant luster, though usually dull from tarnish. It is very brittle, and sublimes at 356 deg Fahrenheit. It is sometimes found native, but usually combined with silver, cobalt, nickel, iron, antimony, or sulphur. Orpiment and realgar are two of its sulphur compounds, the first of which is the true arsenticum of the ancients. The element and its compounds are active poisons. Specific gravity from 5.7 to 5.9. Atomic weight. Symbol As. 2. Arsenious oxide or arsenious anhydride; called also arsenious acid, white arsenic, and ratsbane. <chemistry> Pertaining to, or derived from, arsenic; said of those compounds of arsenic in which this element has its highest equivalence; as, arsenic acid. Origin: L. Arsenicum, Gr, yellow orpiment, perh. Fr. Or better Attic masculine, male, on account of its strength, or fr. Per. Zernikh: cf. F. Arsenic. Source: Websters Dictionary (01 Mar 1998) |
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| arsenic acid | <chemical> The hydrate of arsenic oxide or arsenic pentoxide which forms arsenates with certain bases. (05 Mar 2000) |
| arsenic-fast | Resistant to the poisonous action of arsenic; denoting especially spirochetes and other protozoan parasites, which acquire resistance after repeated administration of the drug. (05 Mar 2000) |
| arsenic pigmentation | Generalised but spotty increased melanin pigmentation of the skin in chronic arsenic poisoning. (05 Mar 2000) |
| arsenic poisoning | A severe poisoning that occurs after the exposure (ingested or inhaled). Signs and symptoms include: nausea, vomiting, diarrhoea, rapid heart rate, apprehension and difficulty breathing. (27 Sep 1997) |
| arsenic trihydride | <chemistry> A compound of arsenic and hydrogen, AsH3, a colourless and exceedingly poisonous gas, having and odour like garlic; arseniureted hydrogen. Origin: From Arsenic. Source: Websters Dictionary (01 Mar 1998) |
| arsenic trioxide | As2O3;dissolves in water to give arsenous acid, H3AsO3; used in the treatment of skin diseases and malaria, and as a tonic; also used externally as a caustic. Synonym: arsenous oxide, white arsenic. (05 Mar 2000) |
| white arsenic | As2O3;dissolves in water to give arsenous acid, H3AsO3; used in the treatment of skin diseases and malaria, and as a tonic; also used externally as a caustic. Synonym: arsenous oxide, white arsenic. (05 Mar 2000) |
| amblyopia | <ophthalmology> The impairment of vision without detectable organic lesion of the eye. (18 Nov 1997) |
| amblyopia ex anopsia | The suppression of the central vision in one eye when the images from the two eyes are so different that they cannot be fused into one. This may be due to: 1) faulty image formation (sensory amblyopia); 2) a large difference in refraction between the two eyes (anisometropic amblyopia); or 3) the two eyes pointing in different directions (strabismic amblyopia). Most suppression amblyopia can be reversed if appropriately treated before age 6 years. Synonym: amblyopia ex anopsia. (05 Mar 2000) |
| anisometropic amblyopia | A suppression of central vision due to an unequal refractive error (anisometropia) of at least two diopters. This induces a sufficient difference in image size (aniseikonia) that the two images cannot be fused. In order to avoid confusion, the blurrier image is suppressed. Synonym: refractive amblyopia. (05 Mar 2000) |
| refractive amblyopia | A suppression of central vision due to an unequal refractive error (anisometropia) of at least two diopters. This induces a sufficient difference in image size (aniseikonia) that the two images cannot be fused. In order to avoid confusion, the blurrier image is suppressed. Synonym: refractive amblyopia. (05 Mar 2000) |
| sensory amblyopia | A suppression of central vision in one eye due to faulty image formation; for example, by a corneal scar, a cataract, or a droopy eyelid. Synonym: deprivation amblyopia. (05 Mar 2000) |
| hysterical amblyopia | An apparent loss of visual acuity or visual field with no substantiating physical signs; often due to a natural concern about visual loss combined with suggestibility and a fear of the worst; best treated with reassurance. (05 Mar 2000) |
| strabismic amblyopia | A suppression of central vision due to the two eyes pointing in different directions. The two scenes cannot be fused into a single image, so, to avoid confusion, one of the images is suppressed. (05 Mar 2000) |
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