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ultrashort

[uhl-truh-shawrt] /ˌʌl trəˈʃɔrt/
adjective
1.
extremely short.
2.
(of a wavelength) smaller than 10 meters.
Origin of ultrashort
1925-1930
First recorded in 1925-30; ultra- + short
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for ultrashort

ultrashort

/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
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