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Tm

Symbol, Chemistry.
  1. thulium.
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TM

t.m.

  1. true mean.
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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for tm

tm

the internet domain name for
  1. Turkmenistan
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Tm

the chemical symbol for
  1. thulium
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TM

abbreviation for
  1. transcendental meditation
  2. Turkmenistan (international car registration)
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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

tm in Medicine

tm

abbr.
  1. temperature midpoint (on the Celsius scale)
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

tm in Science

Tm

  1. The symbol for thulium.
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thulium

[thōōlē-əm]
Tm
  1. 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.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.