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Tm

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Symbol, Chemistry.
  1. thulium.

TM

  1. trademark.
  2. transcendental meditation.

t.m.

  1. true mean.
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

Tm

the chemical symbol for
  1. thulium

TM

abbreviation for
  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

tm in Medicine

tm

abbr.
  1. temperature midpoint (on the Celsius scale)
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.

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.