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TM
| Pronunciation (US): |  | (GB): | |
I. (noun)
Sense 1
Meaning:
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
Synonyms:
atomic number 69; thulium; Tm
Classified under:
Hypernyms ("Tm" is a kind 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.)
Holonyms ("Tm" is a substance of...):
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)
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