 hf |
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| 1. | [ noun ] (chemistry) a gray 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 | |
| Related terms: | metallic_element | |
| 2. | [ noun ] (physics) 3 to 30 megahertz | |
| Synonyms: | high_frequency | |
| Related terms: | radio_frequency electromagnetic_spectrum | |
