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thulium
Nounthulium has 1 sense
thulium, Tm, atomic number 69 - 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 --1is a kind ofmetallic element, metal --1is a substance of apatite; monazite; xenotime