ultrashort

American  

[uhl-truh-shawrt] / ˌʌl trəˈʃɔrt /

adjective

1. extremely short.

2. (of a wavelength) smaller than 10 meters.

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ultrashort British  

/ ˌʌltrəˈʃɔːt /

adjective

1. (of a radio wave) having a wavelength shorter than 10 metres

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Etymology

Origin of ultrashort

First recorded in 1925–30; ultra- + short

Example Sentences

If an investor is choosing between a money-market ETF and an ultrashort bond fund, Kashner says investors need to look at the holdings, as some ultrashort bond ETFs may have a degree of credit risk.

From Barron's • Oct. 15, 2025

In any case, the new methodological possibilities for analyzing fluctuations on ultrashort time scales offer great potential for further discoveries in the field of functional materials.

From Science Daily • Nov. 29, 2023

In the experiment, two ultrashort light pulses are transmitted through the magnet with a time delay, testing the magnetic properties during the transit time of each pulse, respectively.

From Science Daily • Nov. 29, 2023

The photons were contained in ultrashort laser pulses lasting just just 150 femtoseconds and were entangled by passing them through two so-called nonlinear optical crystals.

From Scientific American • Oct. 25, 2022

Half the money went into the ultrashort bond fund, which returned 1.56 percent over the last year.

From New York Times • Jul. 9, 2021