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selenium, Se, atomic number 34 | 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) | |
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southeast, sou'-east, southeastward, SE | the compass point midway between south and east; at 135 degrees |