Selenite may refer to:Substances containing selenium,A selenium-containing anion or ionic compound with the SeO₃²⁻ anion:Selenous acid, the conjugate acid, with the formula H₂SeO₃,Salts of this anion:Silver selenite, an inorganic compound of formula Ag₂SeO₃,Sodium selenite, a salt, a,colourless solid, and the most common water-soluble selenium compound,Selenite (ion), anion is a selenium oxoanion with the chemical formula SeO₃²⁻,Selenite broth, an enrichment medium for the isolation of Salmonella species.other.