Definition of "ultrashort" in English

adjective

1. (technical or informal) Very short.

   • ultrashort skirts

2. (sciences) Extremely short in duration, typically on the femtosecond scale

   • an ultrashort pulse

3. (physics, of a wave) Having a wavelength of between 1 and 10 metres

4. (finance) Having a very short term of investment, typically less than a year

   • an ultrashort bond

noun

1. (finance) A bond with an extremely short term, typically less than a year