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seleni-
Seleniate
Selenic
selenic acid
Selenicereus
Selenicereus grandiflorus
selenide
seleniferous
Selenio-
Selenious
Selenipedium
Selenite
Selenitic
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selenium acids
selenium cell
Seleniuret
Seleniureted
seleniuretted
seleno-
selenocentric
Selenograph
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Selenographic
Selenographic chart
Selenographical
Selenographist

Selenium definitions

Webster's 1828 Dictionary

SELE'NIUM, n. [supra.] A new elementary body or substance, extracted from the pyrite of Fahlun in Sweden. It is of a gray dark brown color, with a brilliant metallic luster, and slighty translucent. It is doubted whether it ought to be classified with the metals.

WordNet (r) 3.0 (2005)

n
1: 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) [syn: selenium, Se, atomic number 34]

Merriam Webster's

noun Etymology: New Latin, from Greek sel?n? 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

Dictionary of the Elements

selenium
Symbol: Se
Atomic number: 34
Atomic weight: 78.96
Metalloid element, belongs to group 16 of the periodic table. Multiple allotropic forms exist. Chemically resembles sulphur. Discovered in 1817 by Jons J. Berzelius.

Oxford Reference Dictionary

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

Webster's 1913 Dictionary

Selenium Se*le"ni*um, n. [NL., from Gr. ??? the moon. So called because of its chemical analogy to tellurium (from L. tellus the earth), being, as it were, a companion to it.] (Chem.) A nonmetallic element of the sulphur group, and analogous to sulphur in its compounds. It is found in small quantities with sulphur and some sulphur ores, and obtained in the free state as a dark reddish powder or crystalline mass, or as a dark metallic-looking substance. It exhibits under the action of light a remarkable variation in electric conductivity, and is used in certain electric apparatus. Symbol Se. Atomic weight 78.9.



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