Balfour (Cyc. of India).
||Ar`a*ro"ba (?), n. [Tupi.] 1. Goa powder.
2. A fabaceous tree of Brazil (Centrolobium robustum) having handsomely striped wood; -- called also zebrawood.
Arc (ärk), v. i. [imp. & p. p. Arcked (ärkt); p. pr. & vb. n. Arcking.] (Elec.) To form a voltaic arc, as an electrical current in a broken or disconnected circuit.
Ar"chi*bald wheel (?). A metal-hubbed wheel of great strength and elasticity, esp. adapted for artillery carriages and motor cars.
Ar"cho*plasm (?), n. [See Archon; Plasma.] (Biol.) The substance from which attraction spheres develop in mitotic cell division, and of which they consist.
Arc light. (Elec.) The light of an arc lamp.
Ar`dois" sys"tem (?). (Naut.) A widely used system of electric night signals in which a series of double electric lamps (white and red) is arranged vertically on a mast, and operated from a keyboard below.
{ A*re"co*line (?), n. Also - lin }. [From NL. Areca, a genus of palms bearing betel nut.] An oily liquid substance, C8H13O2N, the chief alkaloid of the betel nut, to which the latter owes its anthelmintic action.
||A`rête" (?), n. [F., lit., a sharp fish bone, ridge, sharp edge, fr. L. arista beard of grain.] (Geog.) An acute and rugged crest of a mountain range or a subsidiary ridge between two mountain gorges.
Ar`gen*ta"li*um (?), n. [NL.; L. argentum silver + E. aluminium.] A (patented) alloy of aluminium and silver, with a density of about 2.9.
{ Ar*gen"ta*mine (?), n. Also - min }. [L. argentum silver + E. amine.] (Med.) A solution of silver phosphate in an aqueous solution of ethylene diamine, used as an antiseptic astringent and as a disinfectant.
Ar"gon (?), n. [NL., fr. Gr. &?;, neut. of &?; inactive; &?; priv. + &?; work.] (Chem.) A colorless, odorless gas occurring in the air (of which it constitutes 0.93 per cent by volume), in volcanic gases, etc.; -- so named on account of its inertness by Rayleigh and Ramsay, who prepared and examined it in 1894-95. Symbol, A; at. wt., 39.9. Argon is condensible to a colorless liquid boiling at -186.1° C. and to a solid melting at -189.6° C. It has a characteristic spectrum. No compounds of it are known, but there is physical evidence that its molecule is monatomic. Weight of one liter at 0° C. and 760 mm., 1.7828 g.
Ar"go*naut (?), n. One of those who went to California in search of gold shortly after it was discovered there in 1848. [U. S.] Bret Harte.
The "Argonauts of '49" were a strong, self- reliant, generous body of men.