hf

Noun
  1. A grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals;
    Used in filaments for its ready emission of electrons (synset 114663734)
    is a type 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.
    same as: atomic number 72, hafnium
  2. 3 to 30 megahertz (synset 105064744)
    is a type of: radio frequency - an electromagnetic wave frequency between audio and infrared
    is a part of: electromagnetic spectrum - the entire frequency range of electromagnetic waves
    same as: high frequency

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