English noun: Hf | |||
1. | Hf (substance) a grey tetravalent metallic element that resembles zirconium chemically and is found in zirconium minerals; used in filaments for its ready emission of electrons | ||
Synonyms | atomic number 72, hafnium | ||
Broader (hypernym) | metal, metallic element | ||
2. | HF (attribute) 3 to 30 megahertz | ||
Synonyms | high frequency | ||
Broader (hypernym) | radio frequency | ||
Part meronym | electromagnetic spectrum | ||