selenium: 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)
antioxidant: substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides
dicot: flowering plant with two cotyledons; the stem grows by deposit on its outside