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SE

Definition:

[noun] 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: lenium, Se, atomic number 34
[noun] the compass point midway between south and east; at 135 degrees
Synonyms: southeast, sou'-east, SE