Arsenical silver, an ore of silver containing arsenic.

(Ar*sen"i*cate), v. t. [imp. & p. p. Arsenicated; p. pr. & vb. n. Arsenicating.] To combine with arsenic; to treat or impregnate with arsenic.

(Ar*sen"i*cism), n. (Med.) A diseased condition produced by slow poisoning with arsenic.

(Ar"sen*ide) n. (Chem.) A compound of arsenic with a metal, or positive element or radical; — formerly called arseniuret.

(Ar`sen*if"er*ous) a. [Arsenic + -ferous.] Containing or producing arsenic.

(Ar*se"ni*ous) a. [Cf. F. arsénieux.]

1. Pertaining to, consisting of, or containing, arsenic; as, arsenious powder or glass.

Arroyo to Article

(||Ar*roy"o) n.; pl. Arroyos [Sp., fr. LL. arrogium; cf. Gr. river, stream, fr. to flow.]

1. A water course; a rivulet.

2. The dry bed of a small stream. [Western U. S.]

(||Ar"schin) n. See Arshine.

(Arse), n. [AS. ears; ærs; akin to OHG. ars. G. arsch, D. aars, Sw. ars, Dan. arts, Gr. ] The buttocks, or hind part of an animal; the posteriors; the fundament; the bottom.

(Ar"se*nal), n. [Sp. & F. arsenal arsenal, dockyard, or It. arzanale, arsenale (cf. It. & darsena dock); all fr. Ar. darina'a house of industry or fabrication; dar house + ina art, industry.] A public establishment for the storage, or for the manufacture and storage, of arms and all military equipments, whether for land or naval service.

(Ar"se*nate) n. (Chem.) A salt of arsenic acid.

(Ar*se"ni*ate), n. See Arsenate. [R.]

(Ar"se*nic) n. [L. arsenicum, Gr. 'arseniko`n, 'arreniko`n, yellow orpiment, perh. fr. 'arseniko`s or better Attic 'arreniko`s masculine, 'a`rrhn male, on account of its strength, or fr. Per. zernikh: cf. F. arsenic.]

1. (Chem.) 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 color and brilliant luster, though usually dull from tarnish. It is very brittle, and sublimes at 356° 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 arsenicum of the ancients. The element and its compounds are active poisons. Specific gravity from 5.7 to 5.9. Atomic weight 75. Symbol As.

2. (Com.) Arsenious oxide or arsenious anhydride; — called also arsenious acid, white arsenic, and ratsbane.

(Ar*sen"ic), a. (Chem.) Pertaining to, or derived from, arsenic; — said of those compounds of arsenic in which this element has its highest equivalence; as, arsenic acid.

(Ar*sen"ic*al), a. Of or pertaining to, or containing, arsenic; as, arsenical vapor; arsenical wall papers.

  By PanEris using Melati.

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