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

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New Latin, from Latin Thule

First Known Use: 1879

Medical Dictionary

noun thu·li·um \ˈth(y)ü-lē-əm\

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

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