atomic number 34

Noun atomic number 34 has 1 sense

• atomic number 34(n = noun.substance) se, selenium - 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);
is a kind of chemical element, element, antioxidant