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ultrashort

American  
[uhl-truh-shawrt] / ˌʌl trəˈʃɔrt /

adjective

  1. extremely short.

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


ultrashort British  
/ ˌʌltrəˈʃɔːt /

adjective

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

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of ultrashort

First recorded in 1925–30; ultra- + short

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Near-cash instruments like ultrashort bond funds yield even higher but won’t be hurt badly if interest rates continue to rise.

From Barron's May 30, 2026

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 this study, the team has developed a new time-resolved AFM system, enhancing its operability by merging AFM with their unique ultrashort laser pulse technology.

From Science Daily Jan. 31, 2024

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

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