ultrashort

American

[uhl-truh-shawrt] / ˌʌl trəˈʃɔrt /

adjective

extremely short.
(of a wavelength) smaller than 10 meters.

ultrashort British

/ ˌʌltrəˈʃɔːt /

adjective

(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.

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

Lasers that produce ultrashort light pulses deliver exceptional precision for manufacturing, medicine, and scientific studies.

From Science Daily • Nov. 9, 2025

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

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023