Search Result for "atomic_number_69":
Wordnet 3.0

NOUN (1)

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;
[syn: thulium, Tm, atomic number 69]



WordNet (r) 3.0 (2006):

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 [syn: thulium, Tm, atomic number 69]