1. [ noun ] (chemistry) a toxic nonmetallic element related to sulfur and tellurium; occurs in several allotropic forms; a stable gray metallike allotrope conducts electricity better in the light than in the dark and is used in photocells; occurs in sulfide ores (as pyrite)
Synonyms: atomic_number_34 Se
Related terms: chemical_element antioxidant pyrite
Similar spelling:   Sellman