Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun atomic_number_69

1 sense of atomic number 69

Sense 1
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)
       => metallic element, metal -- (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)