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.
Words nearby thulium
thug,
thuggee,
thuja,
thule,
thulia,
thulium,
thumb,
thumb a ride,
thumb drive,
thumb forceps,
thumb glass
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
Medical 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.
Scientific 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.