Synonyms for Selenium (same or very similar meaning)
WordNet sense 1 (a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable grey metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)):
SeFrom the ODE community, based on WordNetadd/edit