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)

[ Syn: selenium , selenium , se , se , atomic number 34 , atomic number 34 ]

the compass point midway between south and east; at 135 degrees

[ Syn: southeast , sou-east , southeastward , se ]