RHODIUM

(Lat.). n. n. Rod(road)'ia-usm(u4m). From poSov. a rose, its chloride being rose-colored. Fr., r. Ger., R. 1. A metallic element discovered by Wollaston in 1803. It occurs in nature usually in connection with platinum. It is a white, lustrous metal, le fusible than platinum even, and scarcely attacked by acids. R. may also be obtained in the form of a black powder. In composition, it acts as a bivalent or quadrivalent radicle, and also, apparently, as a trivalent radicle. Symbol, Rh; atomic weight. 104'1; sp. gr, 12'1. [B, 3.] 2. See Lignum r/iodu. Lignum rhodii. Lignum r. Ger., Rhodiserholz (1st def.). 1. The root-wood of Convolvulus scoparius, probably also of Convolvulus florid us. It has the odor of rosewood, and yields oil of rhodium. 2. American rosewood (wood of Aniyris balsam if era). [a, 35.] Oil of r. Lat., oleum ligni rhodii. A fragrant oil distilled from the wood of Convolvulus scoparius. Convolvulus florid us, and Genista canariensis; used to adulterate oil of rose. A mixture of 1 part of oil of rose and 20 parts of copaiba, used by rat-catchers, is also known by this name, [a, 35.] RHODODENDRON (Lat.), RHODODENDRrM (Lat.), n's n. Rod(road)-o(os)-deand'roan, -U3m(u4m). Gr., poioSivSpov (from poSov. a rose, and StvSpov. a tree). Fr., r. Ger., Alpenrose, Alpbalsam. Rosenbaum (all of 2d def.). 1. Of Dioscorides, the Nerivm (jleander. 2. A genus of shrubs or low trees of the Ericaceae. The Rhododendra and the Rhododendrece (Fr., rho do den drees) are an order or tribe of the Ericaceae. [B, 121, 180 (a, 35).] Infusum rhododendri. Fr., Hydrole (ou infusion) de rosage. An infusion of 7 parts of the leaves of R. chrysanthum in 270 of boiling water, filtered after 24 hours. [B, 119 (a. 38).] R. arboreum. Ger., baumartige Alpertrose. Tree-r., a native of the Him a lay as. A snuff is made from the bark, also a jelly from the subacid flowers. The lower surface of the leaves is covered with a sweet, sugary, edible substance. [B, 172, 180. 275 (o, 35).] R. campanula tum. The bell-flowered r. of Thibet and Cashmere, where the leaves are used as an en-bine. [A, 496; B, 275 (a, 85).] R. chrysanthum. Fr., r. a fleurs jaunes, rose de Siberie. Ger., gelbbliihende (oder goldfarbige) Alpenrose, sibirische (oder gel be) Schneerose. Golden- (or yellow-) flowered r.; a low shrub indigenous to eastern Siberia. The leaves and flowering brant-hlets, folia (seu herb a) et stipites rhododendri chrysanth i, are used in Siberia in rheumatism and gout. They are stimulant, diaphoretic, and diuretic, and, in large doses, narcotic, producing vomiting, purging, and delirium. [B, 5, 173, 180, 275 (a. 35).] R. cinnabarinum. Vermilion-flowered r.; an East Indian poisonous species said to kill goats that eat it, and to produce, when used as fuel, swelling of the face and inflammation of the eyes. [A, 4%: B, 19, 275 (a. 35).] R. dahuricum. Dahurian (or Siberian) r. The balsamic and narcotic leaves are used in gout and rheumatism and to stupefy fish. [B, 180, 275 (a, 35).] R. ferrugineum, R. fus- <-n in. Fr., r. ferrugineux, laurier rose des Alpes, rosage, romarin sauvage. Ger., rostfarbige Alpenrose (oder Alpbalsam, oder Schneerose). Rusty-leaved r., Alpine rose; a small shrub growing in Europe and Middle Asia. The leaves and leafy branchlets, folia (seu herb a) et stipites rhododendri ferruginei (seu rhododendri fusc i), have the properties, though in le degree, of the leaves of R. chrysanthum. In Switzerland they are used in calculous complaints. Galls are formed on this shrub, and in Savoy and Piedmont an oil poured over these galls is used in gout and wounds. [B, 173, 180, 275 (o, 35).] R. hirsutum. Ger., geinmperte Alpenrose. Alpine rose; a hairy-leaved species growing in central Europe; used like R. ferrugineum. [a, 35.] R. lepidotum. Scaly r.; an Indian species. The leaves are very stimulating. [B. 275; A. 496 (a, 35).] R. maximum. Fr., r. d'Amerique. Ger., gro te Alpenrose, gro ter Alpbalsam (oder Rosenbaum ). American great laurel (or rose-bay); found from Canada to the Carol in as. The leaves, folia (seu herb a) rhododendri maxim i, are sometimes substituted for those of R. chrysanthum. They contain tannin, gallic acid, resin, traces of volatile oil, etc.. and a poisonous principle, and rome toxin. [B. 180, 275 (a, 35).] R. offlciiiale. See R. chrysanthum. K. ponticum. Fr., r. de Pont. Ger., pontische Alpenrose. Pontic (or purple-flowered) r.; growing in Asia Minor, Armenia, and southern Spain. It has more or le the properties of R. chrysanthum. and is used in gout and rheumatism. Its flowers, which 'are said to contain and rome toxin. are believed to have furnished the poisonous honey of Xenophon. [B, 5, 173, 180 (a, 35).] E, he; Ea, ell; G. go; I, die; Ia. in: N, in; N, tank; [s. 404]