selenium
suh lee nee uhm
- n 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)
- Home to the world's largest heavy metal smelting complex, more than 4 million tons of cadmium, copper, lead, nickel, arsenic, selenium and zinc are released into the air every .
- As for selenium, the upper limit is 55 micrograms a day.
- In the same study, subjects taking supplements that contained a form of selenium also showed a 63% lower risk of developing prostate cancer.