| As | arsenic; astigmatism; asymptomatic |
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| RM | radical mastectomy; random migration; radon monitor; range of movement; red marrow; reference materi... |
| PAM | Primary acquired melanosis |
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| As | Arsenic |
| 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) |
| melanosis | A disorder caused by a disturbance in melanin pigmentation, melanism. (18 Nov 1997) |
| melanosis circumscripta precancerosa | An obsolete term for lentigo maligna. (05 Mar 2000) |
| melanosis coli | Melanosis of the large intestinal mucosa due to accumulation of pigment of uncertain composition within macrophages in the lamina propria. (05 Mar 2000) |
| melanosis corii degenerativa | A congenital abnormality in which pigment is deposited in whorls and streaks; vesicles occasionally occur, and it may be associated with cardiac or neurologic disorders. Compare: incontinentia pigmenti, incontinentia pigmenti achromians. (05 Mar 2000) |
| Riehl's melanosis | A brown pigmentary condition of the exposed portions of the skin of the neck and face with melanin pigment in dermal macrophages, thought to result from photodermatitis due to materials, such as cosmetic ingredients, or oils encountered in various occupations. (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) |
| precancerous melanosis of Dubreuilh | An obsolete term for lentigo maligna. (05 Mar 2000) |
| neurocutaneous melanosis | Cutaneous giant pigmented nevi associated with melanosis of the leptomeninges; malignant melanomas may develop in the skin or meninges. (05 Mar 2000) |
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