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Noun: Hf
  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
    - hafnium, atomic number 72
Noun: HF
  1. 3 to 30 megahertz
    - high frequency

Type of: metal, metallic element, radio frequency

Part of: electromagnetic spectrum

Encyclopedia: Hf