Try Our Apps
Dictionary.com

follow Dictionary.com

Famous Last Words

thulium

[thoo-lee-uh m] /ˈθu li əm/
noun, Chemistry.
1.
a rare-earth metallic element found in the minerals euxenite, gadolinite, etc. Symbol: Tm; atomic weight: 168.934; atomic number: 69; specific gravity: 9.32.
Origin of thulium
1875-1880
From New Latin, dating back to 1875-80; See origin at Thule, -ium
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
Cite This Source
British Dictionary definitions for thulium

thulium

/ˈθjuːlɪəm/
noun
1.
a malleable ductile silvery-grey element occurring principally in monazite. The radioisotope thulium-170 is used as an electron source in portable X-ray units. Symbol: Tm; atomic no: 69; atomic wt: 168.93421; valency: 3; relative density: 9.321; melting pt: 1545°C; boiling pt: 1950°C
Word Origin
C19: New Latin, from Thule + -ium
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
Cite This Source
thulium in Medicine

thulium thu·li·um (thōō'lē-əm, thyōō'-)
n.
Symbol Tm
A rare-earth element having an x-ray emitting isotope that is used in small portable medical x-ray units. Atomic number 69; atomic weight 168.934; melting point 1,545°C; boiling point 1,946°C; specific gravity 9.3; valence 3.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Cite This Source
thulium in Science
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.
Cite This Source

Word of the Day

Difficulty index for thulium

Some English speakers likely know this word

Word Value for thulium

12
15
Scrabble Words With Friends

Related Word

Nearby words for thulium

Heartbreak