Library / English Dictionary

    TM

    Pronunciation (US): Play  (GB): Play

     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 xenotimeplay

    Synonyms:

    atomic number 69; thulium; Tm

    Classified under:

    Nouns denoting substances

    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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