atomic number 65
English Thesaurus
1. a metallic element of the rare earth group; used in lasers; occurs in apatite and monazite and xenotime and ytterbite (noun.substance)
| hypernym | : | metal, metallic element, |
| definition | : | any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. (noun.substance) |
| substance meronym | : | apatite, |
| definition | : | a common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus (noun.substance) |
| substance meronym | : | gadolinite, ytterbite, |
| definition | : | a mineral that is a source of rare earths; consists of silicates of iron and beryllium and cerium and yttrium and erbium (noun.substance) |
| substance meronym | : | monazite, |
| definition | : | a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium (noun.substance) |
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