selenium

[ si-lee-nee-uhm ]

/ sɪˈli ni əm /

noun Chemistry.

a nonmetallic element chemically resembling sulfur and tellurium, occurring in several allotropic forms, as crystalline and amorphous, and having an electrical resistance that varies under the influence of light. Symbol: Se; atomic weight: 78.96; atomic number: 34; specific gravity: (gray) 4.80 at 25°C, (red) 4.50 at 25°C.

Origin of selenium

<New Latin (1818) <Greek selḗn(ē) moon + New Latin -ium-ium; named in allusion to its similarity to tellurium

Words nearby selenium

selenide, seleniferous, selenious, selenious acid, selenite, selenium, selenium cell, selenium rectifier, seleno-, selenocentric, selenodesy

Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for selenium

He was also the person who first identified silicon, selenium, thorium, and serium.
After Dominick|J. J. Berzelius|November 7, 2008|DAILY BEAST
When the bridge is balanced, one-half of the current flows through the cell and acts upon the selenium.
Scientific American Supplement, No. 492, June 6, 1885|Various
The selenium is applied to the cell duly heated: next comes annealing.
Inventors at Work|George Iles
If this solution is poured into water, the selenium separates and is thrown down.
Cooley's Practical Receipts, Volume II|Arnold Cooley

It occurs still more rarely in the metallic form, or combined with silver, selenium, or chlorine.
A System of Instruction in the Practical Use of the Blowpipe|Anonymous
The greatest effect of the light would be to annul the resistance of the selenium.
Scientific American Supplement, No. 484, April 11, 1885|Various

British Dictionary definitions for selenium

selenium

/ (sɪˈliːnɪəm) /

noun

a nonmetallic element that exists in several allotropic forms. It occurs free in volcanic areas and in sulphide ores, esp pyrite. The common form is a grey crystalline solid that is photoconductive, photovoltaic, and semiconducting: used in photocells, solar cells, and in xerography. Symbol: Se; atomic no: 34; atomic wt: 78.96; valency: –2, 4, or 6; relative density: 4.79 (grey); melting pt: 221°C (grey); boiling pt: 685°C (grey)

Word Origin for selenium

C19: from New Latin, from Greek selēnē moon; named by analogy to tellurium (from Latin tellus earth)

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for selenium

selenium

[ sĭ-lē′nē-əm ]

n. Symbol Se

A nonmetallic essential trace element used in its disulfide form as an antiseborrheic and as a radioisotope to image the pancreas and parathyroid glands. Atomic number 34.

Scientific definitions for selenium

selenium

[ sĭ-lē′nē-əm ]

Se

A nonmetallic element that occurs in a gray crystalline form, as a red powder, or as a black glassy material. It is highly photosensitive and can be used to convert light into electricity. Its ability to conduct electricity also increases with higher exposure to light. For these reasons selenium is used in photocopying technology, photography, and solar cells. Atomic number 34; atomic weight 78.96; melting point 217°C; boiling point 684.9°C; specific gravity (gray) 4.79; (red) 4.5; (black) 4.28; valence 2, 4, or 6. See Periodic Table.

单词	selenium
释义	selenium [ si-lee-nee-uhm ] / sɪˈli ni əm / noun Chemistry. a nonmetallic element chemically resembling sulfur and tellurium, occurring in several allotropic forms, as crystalline and amorphous, and having an electrical resistance that varies under the influence of light. Symbol: Se; atomic weight: 78.96; atomic number: 34; specific gravity: (gray) 4.80 at 25°C, (red) 4.50 at 25°C. Origin of selenium <New Latin (1818) <Greek selḗn(ē) moon + New Latin -ium-ium; named in allusion to its similarity to tellurium Words nearby selenium selenide, seleniferous, selenious, selenious acid, selenite, selenium, selenium cell, selenium rectifier, seleno-, selenocentric, selenodesy Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 Example sentences from the Web for selenium He was also the person who first identified silicon, selenium, thorium, and serium. After Dominick\|J. J. Berzelius\|November 7, 2008\|DAILY BEAST When the bridge is balanced, one-half of the current flows through the cell and acts upon the selenium. Scientific American Supplement, No. 492, June 6, 1885\|Various The selenium is applied to the cell duly heated: next comes annealing. Inventors at Work\|George Iles If this solution is poured into water, the selenium separates and is thrown down. Cooley's Practical Receipts, Volume II\|Arnold Cooley It occurs still more rarely in the metallic form, or combined with silver, selenium, or chlorine. A System of Instruction in the Practical Use of the Blowpipe\|Anonymous The greatest effect of the light would be to annul the resistance of the selenium. Scientific American Supplement, No. 484, April 11, 1885\|Various British Dictionary definitions for selenium selenium / (sɪˈliːnɪəm) / noun a nonmetallic element that exists in several allotropic forms. It occurs free in volcanic areas and in sulphide ores, esp pyrite. The common form is a grey crystalline solid that is photoconductive, photovoltaic, and semiconducting: used in photocells, solar cells, and in xerography. Symbol: Se; atomic no: 34; atomic wt: 78.96; valency: –2, 4, or 6; relative density: 4.79 (grey); melting pt: 221°C (grey); boiling pt: 685°C (grey) Word Origin for selenium C19: from New Latin, from Greek selēnē moon; named by analogy to tellurium (from Latin tellus earth) Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Medical definitions for selenium selenium [ sĭ-lē′nē-əm ] n. Symbol Se A nonmetallic essential trace element used in its disulfide form as an antiseborrheic and as a radioisotope to image the pancreas and parathyroid glands. Atomic number 34. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company. Scientific definitions for selenium selenium [ sĭ-lē′nē-əm ] Se A nonmetallic element that occurs in a gray crystalline form, as a red powder, or as a black glassy material. It is highly photosensitive and can be used to convert light into electricity. Its ability to conduct electricity also increases with higher exposure to light. For these reasons selenium is used in photocopying technology, photography, and solar cells. Atomic number 34; atomic weight 78.96; melting point 217°C; boiling point 684.9°C; specific gravity (gray) 4.79; (red) 4.5; (black) 4.28; valence 2, 4, or 6. See Periodic Table. The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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