DICT.TW Dictionary Taiwan

 hf
 high frequency（高頻）的簡寫

 Hf
      n 1: a gray tetravalent metallic element that resembles zirconium
           chemically and is found in zirconium minerals; used in
           filaments for its ready emission of electrons [syn: hafnium,
            atomic number 72]
      2: 3 to 30 megahertz [syn: high frequency]