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English Dictionary: atomic number 69 by the DICT Development Group
1 result for atomic number 69
From WordNet (r) 3.0 (2006) [wn]:
atomic number 69
n
  1. 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
    Synonym(s): thulium, Tm, atomic number 69
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