thulium
English Thesaurus
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 (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 | : | monazite, |
| definition | : | a reddish-brown mineral containing rare earth metals; an important source of thorium and cerium (noun.substance) |
| substance meronym | : | xenotime, |
| definition | : | a brown-to-yellow mineral that is a phosphate of yttrium in crystalline form (noun.substance) |
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