WordReference Random House Unabridged Dictionary of American English © 2024Hertz′ian wave′, [Physics.]- Physicsan electromagnetic wave produced by oscillations in an electric circuit, as a radio or radar wave: first investigated by H. R. Hertz.
Collins Concise English Dictionary © HarperCollins Publishers::
Hertzian wave n - an electromagnetic wave with a frequency in the range from about 3 × 1010 hertz to about 1.5 × 105 hertz
Etymology: 19th Century: named after H. R. Hertz