Dictionary

thulium

noun thu·li·um \ˈthü-lē-əm, ˈthyü-\

Definition of THULIUM

:  a soft silvery metallic element of the rare-earth group — see element table

Origin of THULIUM

New Latin, from Latin Thule
First Known Use: 1879

thulium

noun thu·li·um \ˈth(y)ü-lē-əm\   (Medical Dictionary)

Medical Definition of THULIUM

:  a trivalent metallic element of the rare-earth group—symbol Tm; see element table

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