Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun hf

2 senses of hf

Sense 1
hafnium, Hf, atomic number 72 -- (a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons)
       => metallic element, metal -- (any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.)

Sense 2
high frequency, HF -- (3 to 30 megahertz)
       => radio frequency -- (an electromagnetic wave frequency between audio and infrared)