Iodum

(if-o-din, i-of-dum) [\li6rjq, violet-colored, from lov, a violet; eidog, appearance]. Symbol I; atomic weight 126.53; quantivalence I; specific gravity 4.948 at 170 C. (62. 6° F.). A nonmetallic element with metallic luster, volatilizing at a low temperature, and giving off an irritating crimson - purple vapor. It occurs in most marine plants, in shell-fish, and in cod-liver oil. It is soluble in alcohol, in solutions of pota ium iodid and of sodium chlorid. It is a powerful irritant, and is used chiefly as an alterative in scrofula and rickets; as an absorbent in goiter and lymphatic enlargements; as a counterirritant, and to produce inflammatory reaction in hydrocele and other cysts. The long-continued use of iodin and its preparation produces a form of poisoning termed iodism. See Iodism. I. -green, a green pigment derived from coal-tar, used in histologic work. ’ Lin i mentum iodi (B. P.), used locally. Liquor iodi compos it us, Lugol’s solution. Dose Tt\J-x (0.065-0.65). Tinct. iodi. Dose n\v-xv (0.32-1.0). It is chiefly used locally. Unguentum iodi, is used locally as an absorbent. Vapor iodi (B\ P.), used for inhalation. 341