selenium

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se·le·ni·um

 (sĭ-lē′nē-əm)
n. Symbol Se
A nonmetallic element, red in powder form, black in vitreous form, and metallic gray in stable crystalline form, resembling sulfur and found as an impurity in pyrites or obtained as a byproduct of electrolytic copper refining. It is widely used in rectifiers, as a semiconductor, and in xerography. Its photovoltaic and photoconductive actions make it useful in photocells, photographic exposure meters, and solar cells. Atomic number 34; atomic weight 78.96; melting point (gray) 221°C; boiling point (gray) 685°C; specific gravity (gray) 4.79; (vitreous) 4.28; valence 2, 4, or 6. See Periodic Table.

[Greek selēnē, moon (from selas, light, brightness) + -ium.]

selenium

(sɪˈliːnɪəm)
n
(Elements & Compounds) 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)
[C19: from New Latin, from Greek selēnē moon; named by analogy to tellurium (from Latin tellus earth)]

se•le•ni•um

(sɪˈli ni əm)

n.
a nonmetallic element occurring in several allotropic forms and having an electrical resistance that varies under the influence of light. Symbol: Se; at. wt.: 78.96; at. no.: 34; sp. gr.: (gray) 4.80 at 25°C, (red) 4.50 at 25°C.
[< New Latin (1818) < Greek selḗn(ē) moon + New Latin -ium -ium2]

se·le·ni·um

(sĭ-lē′nē-əm)
Symbol Se A nonmetallic element that can exist as a gray crystal, a red powder, or a black glassy material. It can convert light directly into electricity, and its ability to conduct electricity increases as light striking it becomes more intense. Because of this, selenium is used in copy machines, photography, and solar cells. Atomic number 34. See Periodic Table.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.selenium - a toxic nonmetallic element related to sulfur and telluriumselenium - 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)
chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
fool's gold, iron pyrite, pyrite - a common mineral (iron disulfide) that has a pale yellow color
antioxidant - substance that inhibits oxidation or inhibits reactions promoted by oxygen or peroxides
Translations
селен
selen
selen
seleen
seleeni
selenij
szelén
selen
セレン
seleenselenium
selen
selen
selen
selen
селен

selenium

[sɪˈliːnɪəm] Nselenio m

selenium

nSelen nt

selenium

n selenio
References in periodicals archive ?
The second chapter addresses growth of copper, zinc, and tin sulfides and selenides as binary compounds for absorbers or windows and their structural, optical, and electrical properties.
Mechanisms for the conversion of selenite to selenides in mammalian tissues.
Cadmolith colors are red and yellow lithopone cadmium sulfides and selenides with good hiding power, good resistance to light and heat, inertness, and insolubility in organic media.
The Hg-binding affinity constant of the free selenides that form during each cycle of selenocysteine synthesis have an exceptionally high affinity constant for Hg: [10.
Under highly reducing conditions, both elemental Se (0) and the most reduced form Se (2) are stable; the latter may form stable metal selenides.
Bill Pinch collaborated with the National Museums of Canada in placing a most interesting display of selenides and tellurides.
It specializes in the formation of nanocrystals consisting of the selenides or sulfides of the majority of metals, particularly zinc, cadmium, gallium, and indium.
This project which was an integral part of the program at NBS to develop measurement methods and data to further the manufacture and use of ceramic materials, included a comprehensive review an d upgrade of data for selected borides, carbides, silicides, nitrides, oxynitrides, selenides, tellurides and oxides.
SYNTHESIS, STRUCTURE, AND PROPERTIES OF NOVEL QUATENARY METAL SELENIDES
This procedure is very general; sulfides, selenides and tellurides have been prepared.
Cadmolith colors are red and yellow litho-pone cadmium sulfides and selenides with good hiding power, good resistance to light and heat, inertness, and insolubility in organic media.