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Noun: gremlin  grem-lin
  1. (folklore) fairies that are somewhat mischievous
    - elf, hob, pixie, pixy, brownie, imp
     
  2. [informal] An odd, unexpected or unknown problem
    "we've found a few gremlins running the latest update"

Derived forms: gremlins

Type of: faerie, faery, fairy, fay, sprite

Encyclopedia: Gremlin