thulium
[ thoo-lee-uh m ]
/ ˈθu li əm /
noun Chemistry.
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.
Nearby words
thug, thuggee, thuja, thule, thulia, thulium, thumb, thumb a ride, thumb drive, thumb forceps, thumb glass
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British Dictionary definitions for thulium
thulium
/ (ˈθjuːlɪəm) /
noun
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 for thulium
C19: New Latin, from Thule + -ium
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
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Medicine definitions for thulium
thulium
[ thōō′lē-əm ]
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.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Science definitions for thulium
thulium
[ thōō′lē-əm ]
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
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