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Tm

Symbol, Chemistry
1.

t.m.

1.
true mean.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for TM

tm

abbreviation
1.
Turkmenistan

Tm

Chemical symbol
1.
thulium

TM

abbreviation
1.
transcendental meditation
2.
Turkmenistan (international car registration)
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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TM in Medicine

tm abbr.
temperature midpoint (on the Celsius scale)

Tm 1

The symbol for the element thulium.

Tm 2
abbr.

  1. transport maximum

  2. tubular maximum

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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TM in Science
Tm  
The symbol for thulium.
thulium
  (th'lē-əm)   
Symbol Tm
A soft, silver-gray metallic element of the lanthanide series. One of its artificial radioactive isotopes is used as a radiation source in small, portable x-ray machines. Atomic number 69; atomic weight 168.934; melting point 1,545°C; boiling point 1,727°C; specific gravity 9.3; valence 2, 3. See Periodic Table.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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TM in Technology

1. Turing Machine.
2. A formal database specification language.
[Jargon File]
networking
The country code for Turkmenistan.
Heavily used for vanity domains because it looks like the abbreviation for "trademark".
(1999-01-27)
The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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Related Abbreviations for TM

Tm

  1. thulium
  2. Timothy

TM

  1. telemetry
  2. them (shortwave transmission)
  3. trademark
  4. transcendental meditation
  5. true mean
  6. Turkmenistan (international vehicle ID)
  7. tympanic membrane

T.M.

Tax Magazine
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 TM

Tm

(Tm), chemical element, rare-earth metal of the lanthanoid series of the periodic table. One of the rarest of the rare-earth elements, though more abundant than silver, thulium has few commercial uses. Natural thulium is wholly composed of the stable isotope thulium-169. Bombarded by neutrons, it becomes radioactive thulium-170 (128-day half-life), which ejects soft gamma radiation (0.084 million electron volts) resembling an X ray. It is useful in small portable X-ray units suitable for photographing bony tissues and for examining thin-walled machine parts and has been used by archaeologists to examine markings and symbols on ancient metallic artifacts.

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