terbium

Noun
  1. A metallic element of the rare earth group;
    Used in lasers;
    Occurs in apatite and monazite and xenotime and ytterbite (synset 114681745)
    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
    • gadolinite, ytterbite - a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium
    • monazite - a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium
    same as: atomic number 65, tb

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