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Definition of Thulium
1. Noun. A soft silvery metallic element of the rare earth group; isotope 170 emits X-rays and is used in small portable X-ray machines; it occurs in monazite and apatite and xenotime.
Exact synonyms: Atomic Number 69, Tm
Generic synonyms: Metal, Metallic Element
Substance meronyms: Apatite, Monazite, Xenotime
Generic synonyms: Metal, Metallic Element
Substance meronyms: Apatite, Monazite, Xenotime
Definition of Thulium
1. n. A rare metallic element of uncertain properties and identity, said to have been found in the mineral gadolinite.
Definition of Thulium
1. a metallic element [n -S]
Medical Definition of Thulium
1.