Tm

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Definition
  1. Noun:
    • A chemical element: A soft, silvery-white, metallic element belonging to the lanthanide series (rare earth group). Its atomic number is 69. One of its isotopes (Tm-170) is used as a portable source of X-rays. It is found in minerals such as monazite, apatite, and xenotime.
Usage Examples
  • Noun:
    • The symbol for the element tm is Tm.
    • Scientists studied the properties of tm in the laboratory.
    • Tm-170 is useful in certain medical and industrial imaging applications.
Advanced Usage
  • Scientific Context: The term is almost exclusively used in scientific, technical, and academic writing related to chemistry, geology, materials science, and nuclear physics.
    • The sample was doped with traces of tm to alter its magnetic properties.
Variants and Related Words
  • Thulium: The full, standard name for the element 'tm'. 'Tm' is its chemical symbol.
  • Rare-earth element / Lanthanide: The category of elements to which thulium belongs.
Synonyms
  • Thulium (This is not a synonym but the full name for the symbol 'Tm').
Notes on Meaning
  • Primary Meaning: The sole common meaning of 'tm' (when capitalized as 'Tm') is as the chemical symbol for the element Thulium. It is not a standard English word outside of this scientific context.
  • Other Uses: In informal digital communication (e.g., texting, social media), lowercase 'tm' is sometimes used as an abbreviation for "trademark" (™) or "topic marker," but these are abbreviations, not the word itself as defined here. The chemical symbol is always capitalized ('Tm').
Noun
  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

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