selenium, n.
(selenia)
(selenia)
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)
<noun.substance>
Se atomic number 34 selenium
semantic pointers
hypernym
substance holonym