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TB

1.
tubercle bacillus.
Also, T.B.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for t. b

tb

abbreviation
1.
trial balance
2.
Also TB. tuberculosis

Tb

Chemical symbol
1.
terbium

TB

abbreviation
1.
torpedo boat
2.
Also tb. tuberculosis
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
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t. b in Medicine

Tb 1

The symbol for the element terbium.

TB or T.B.
abbr.
tuberculosis

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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t. b in Science
Tb  
The symbol for terbium.
TB  
  1. Abbreviation of terabyte

  2. Abbreviation of tuberculosis


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Related Abbreviations for t. b

tb

  1. tablespoon
  2. tablespoonful

Tb

  1. terbium
  2. Tobit

TB

  1. tailback
  2. Tampa Bay Buccaneers
  3. Tampa Bay Devil Rays
  4. terabyte
  5. total bases
  6. trial balance
  7. tuberculosis
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 Article for t. b

Tb

(Tb), chemical element, rare-earth metal of the lanthanoid series of the periodic table. One of the least abundant of the rare earths, terbium, when reduced to metallic form, is silvery white and is slowly oxidized by air at room temperatures and by cold water. The element was discovered in 1843 by Carl Gustaf Mosander in a heavy rare-earth fraction called yttria, but its existence was not confirmed for at least 30 years, and pure compounds were not prepared until 1905. Terbium occurs in many rare-earth minerals but is almost exclusively obtained as a by-product from monazite sands, which are a source of thorium. It is also found in the products of nuclear fission. Ion-exchange techniques are utilized for its commercial production. The metal is prepared in a highly pure form by thermoreduction of the anhydrous fluoride with calcium metal. At room temperature the atoms of the pure element adopt the hexagonal close-packed structure. The only isotope occurring in ores is terbium-159. About 20 radioactive artificial isotopes have been prepared, such as terbium-160 (73-day half-life). Sodium terbium borate as a laser material emits coherent light at 5,460 angstroms. In certain solid-state devices terbium is used to dope calcium fluoride, calcium tungstate, and strontium molybdate.

Learn more about Tb with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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