A nonmetallic chemical element (symbol Se) with an atomic number of 34, used mainly in glassmaking and pigments and as a semiconductor. / A single atom of this element.

plural of selenium

a photoelectric cell that uses a strip of selenium as the electron source

(inorganic chemistry) The binary compound of selenium and fluorine SeF₆.

A material, produced by fermentation of Saccharomyces cerevisiae in the presence of selenium, that has selenium atoms incorporated into the amino acid methionine

plural of selenium eye

(astronomy, historical) A device consisting of a closeable ball of blackened wood surrounding a glass lens that focuses light onto a selenium cell attached to a galvanometer; used by astronomers to measure the light variations of a heavenly body.

plural of selenium yeast