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CAESIUM

 - 8 dictionary results

cae⋅si⋅um

  [see-zee-uhm]
Use CAESIUM in a Sentence
–noun Chemistry.
cesium.

ce⋅si⋅um

  [see-zee-uhm]
–noun
a rare, highly reactive, soft, metallic element of the alkali metal group, used chiefly in photoelectric cells. Symbol: Cs; atomic weight: 132.905; atomic number: 55; specific gravity: 1.9 at 20°C; melts at 28.5°C.
Also, caesium.

Origin:
1930–35; < NL, special use of L caesium, neut. of caesius bluish-grey; see -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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cae·si·um   (sē'zē-əm)   
n.  Variant of cesium.
ce·si·um also cae·si·um   (sē'zē-əm)   
n.   Symbol Cs
A soft, silvery-white ductile metal, liquid at room temperature, the most electropositive and alkaline of the elements, used in photoelectric cells and to catalyze hydrogenation of some organic compounds. Atomic number 55; atomic weight 132.905; melting point 28.5°C; boiling point 690°C; specific gravity 1.87; valence 1. See Table at element.

[From Latin caesius, bluish gray (from its blue spectral lines).]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

cesium 
coined by Bunsen and Kirchhoff in 1860, from L. caesius "blue-gray," in reference to the two blue lines in its spectrum.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

Main Entry: caesium
chiefly British variant of CESIUM

Main Entry: ce·si·um
Variant: or chiefly British cae·si·um /'sE-zE-&m/
Function: noun
: a silver-white softductile element of the alkali metal group that is the most electropositive element known and that is used especially in photoelectric cells —symbol Cs; —see ELEMENT table
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

cesium ce·si·um or cae·si·um (sē'zē-əm)
n.
Symbol Cs
A soft ductile metal, liquid at room temperature, the most electropositive and alkaline of the elements, used in photoelectric cells. Atomic number 55; atomic weight 132.905; melting point 28.4°C; boiling point 671°C; specific gravity 1.87; valence 1.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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