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  1. Oxford American Dictionary

    ultrashort

    • IPA[ˌəltrəˈSHôrt]

    美式

    • adj.
      (of radio waves) having a wavelength significantly shorter than that of the usual shortwaves, in particular shorter than 10 meters (i.e., of a VHF frequency above 30 MHz).
    • 更多解釋

    ultrashort

    • IPA[ʌltrəˈʃɔːt]

    英式

    • adj.
      (of radio waves) having a wavelength significantly shorter than that of the usual short waves, ...

    Oxford Dictionary