Definition of ultrashort adjective from the Oxford Advanced Learner's Dictionary

 

ultrashort

 adjective
adjective
BrE BrE//ˌʌltrəˈʃɔːt//
 
; NAmE NAmE//ˌʌltrəˈʃɔːrt//
 
 
jump to other results
(of radio waves) having a very short wavelength (shorter than 10 metres), with a frequency greater than 30 megahertz compare long wave, medium wave, short wave
See the Oxford Advanced American Dictionary entry: ultrashort