ultrashort

[uhl-truh-shawrt]
adjective
1.
extremely short.
2.
(of a wavelength) smaller than 10 meters.

Origin:
1925–30; ultra- + short

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Collins
World English Dictionary
ultrashort (ˌʌltrəˈʃɔːt)
 
adj
(of a radio wave) having a wavelength shorter than 10 metres

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
So the hand-operated coconut would necessitate the concurrent development of the ultrashort palm tree.
The ultrashort-pulse laser represents a major advancement in cutting technology.
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