Merriam-Webster Collegiate Dictionary - selenium
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Selenium
selenium
noun Etymology: New Latin, from Greek selene moon, from selas brightness Date: 1818 a photosensitive element that occurs in both crystalline and amorphous forms, is obtained chiefly as a by-product in copper refining, and is used especially in glass, semiconductor devices, and alloys — see element table
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1.
n. Chem. a non-metallic element occurring naturally in various metallic sulphide ores and characterized by the variation of its electrical resistivity with intensity of illumination. Usage Symb.: Se. Phrases and idioms selenium cell a piece of this used as a photoelectric device. Derivatives selenate n. selenic adj. selenious adj. Etymology: mod.L f. Gk selene moon + -IUM ...Толковый словарь английского языка Oxford English Reference
Большой Англо-русский Русско-английский политехнический словарь
Англо-русский Русско-английский научно-технический словарь
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6.
~ n a poisonous element (1) that is not a metal and is used in some electrical instruments to make them sensitive to light ...Longman Dictionary of Contemporary English
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