atomic number 34

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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, Se
• Hypernyms:
chemical element, element, antioxidant
• Substance Holonyms:
pyrite, iron pyrite, fool's gold