TB

Dictionary.com Unabridged

TB

Symbol, Computers.

Tb

1.
tubercle bacillus.

Tb

Symbol, Chemistry.

t.b.

1.
trial balance.
2.
tubercle bacillus.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
tb
 
abbreviation for
1.  trial balance
2.  Also: TB tuberculosis

Tb
 
the chemical symbol for
terbium

TB
 
abbreviation for
1.  torpedo boat
2.  Also: tb tuberculosis

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

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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American Heritage
Science Dictionary
Tb  
The symbol for terbium.
TB  
  1. Abbreviation of terabyte

  2. Abbreviation of tuberculosis


terbium   (tûr'bē-əm)  Pronunciation Key 
Symbol Tb
A soft, silvery-gray metallic element of the lanthanide series. It is used in color television tubes, x-ray machines, and lasers. Atomic number 65; atomic weight 158.925; melting point 1,356°C; boiling point 3,123°C; specific gravity 8.229; valence 3, 4. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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FOLDOC
Computing Dictionary

TB definition


terabyte

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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American Heritage
Abbreviations & Acronyms
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

t.b.
tubercle bacillus
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

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.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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