selenium oxides

pl. Chem.: Selenious oxide, SeO2, is the only oxide of which the composition is exactly known. It is formed when selenium is burnt in a stream of oxygen. At a heat below redne it volatilizes in the form of a yellow vapor which condenses in white four-sided needles. It readily takes up water, form ing selenious acid. The trioxide, SeO3, the anhydride of selenic acid, is not known. selenium-sulphur, s. [SELENIC-SULPHUR.] *se-len-1-ür-ět, *se-len-ür-ět, s. [English zeleni ( um ), and uret.] Chem.: Selenide (q. v.). sě-len-o-, sẽ-lēn-i-ō-, sě-len-, pref. [Greek selene the moon, a crescent.] 1. Of or pertaining to the moon. 2. Crescentic. 3. Pertaining to or containing selenium (q. v.). sě-len-ō-biş-muth-ite, s. [Pref. sele no- (3), and Eng. bismuthite .] Min.: A variety of bismuthinite (q. v.), stated to contain 10 per cent. of selenium. Found in Wermland, Sweden.