GD

Dictionary.com Unabridged

Gd

Symbol, Chemistry.

gd.

1.

G.D.

1.
Grand Duchess.
2.
Grand Duke.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
gd
 
the internet domain name for
Grenada

Gd
 
the chemical symbol for
gadolinium

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage
Medical Dictionary

Gd
The symbol for the element gadolinium.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
Gd  
The symbol for gadolinium.
gadolinium   (gād'l-ĭn'ē-əm)  Pronunciation Key 
Symbol Gd
A silvery-white, malleable, ductile metallic element of the lanthanide series that has seven natural isotopes and 11 artificial isotopes. Two of the natural isotopes, Gd 155 and Gd 157, are the best known neutron absorbers. Gadolinium is used to improve the heat and corrosion resistance of iron, chromium, and various alloys and in medicine as a contrast medium for magnetic resonance imaging and as a radioisotope in bone mineral analysis. Atomic number 64; atomic weight 157.25; melting point 1,312°C; boiling point approximately 3,000°C; specific gravity from 7.8 to 7.896; valence 3. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

gd definition

networking
The country code for Grenada.
(1999-01-27)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
gd
Scots Gaelic
Gd
gadolinium
GD
  1. geologic division

  2. goddamn

  3. good (shortwave transmission)

  4. good for the day order

gd.
good
G.D.
grand duchy
The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

gd

(Gd), chemical element, rare-earth metal of the lanthanoid series of the periodic table. Silvery white and moderately ductile, the metal reacts slowly with oxygen and water. Below 17 C it is ferromagnetic and at very low temperatures, superconducting. Credit for the discovery of gadolinium is shared by J.-C.-G. de Marignac and P.-E. Lecoq de Boisbaudran. Marignac separated (1880) a new rare earth (metallic oxide) from the mineral samarskite; Lecoq de Boisbaudran obtained (1886) a fairly pure sample of the same earth, which with Marignac's assent he named gadolinia, after a mineral in which it occurs that in turn had been named for the Finnish chemist Johan Gadolin. Gadolinium occurs in many minerals along with the other rare earths but is obtained primarily from monazite. It is found also in the products of nuclear fission. Commercial separation depends upon ion-exchange techniques. The metal has been produced by thermoreduction of the anhydrous chloride or fluoride by calcium.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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