Noun elf has 2 senses
  1. elf, hob, gremlin, pixie, pixy, brownie, imp - (folklore) fairies that are somewhat mischievous
    --1 is a kind of fairy, faery, faerie, sprite
    --1 has particulars: leprechaun; sandman
  2. extremely low frequency, ELF - below 3 kilohertz
    --2 is a kind of radio frequency
    --2 is a part of electromagnetic spectrum
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