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.
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
(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.
Arsenical silver, an ore of silver containing arsenic.
(Ar*sen"ic*al), a. Of or pertaining to, or containing, arsenic; as, arsenical vapor; arsenical wall
(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.