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

"We measure very fast fluctuations and have developed a method with which fluctuations can still be detected on the ultrashort time scale of femtoseconds," says experimental physicist Sebastian Gönnenwein.

From Science Daily • Nov. 29, 2023

So, Amina Salamova, Guomao Zheng and Stephanie Eick wanted to see if ultrashort PFAAs are accumulating in homes and in human bodies and understand how they might be getting there.

From Science Daily • Oct. 11, 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

The municipal money-market fund yield today is exactly zero, and the ultrashort bond fund pays 0.28 percent.

From New York Times • Jul. 9, 2021