Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of or relating to radio waves with a wavelength less than 10 meters (33 feet).
  • adj. Of extremely short duration: an ultrashort flash.
  • adj. Extremely short: an ultrashort skirt.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Extremely short in duration, typically on the femtosecond scale
  • adj. Having a wavelength of between 1 and 10 metree
  • adj. Having a very short term of investment, typically less than a year
  • n. A bond with an extremely short term, typically less than a year

Etymologies

ultra- +‎ short (Wiktionary)

Examples

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