atomic number 69

Noun
  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 (synset 114682725)
    is a type of: metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
    substance meronym:
    • apatite - a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus
    • monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium
    • xenotime - a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form
    same as: thulium, tm

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