Relating to electromagnetic radiation or waves, especially in reference to Heinrich Hertz's discovery of radio waves.
From Heinrich Hertz + the adjective suffix '-ian,' used in physics to describe phenomena involving electromagnetic waves that Hertz experimentally demonstrated.
Hertzian waves were the key discovery that proved Maxwell's electromagnetic theory was correct—without Hertz's 1887 experiments, we wouldn't have radio, radar, Wi-Fi, or cell phones today.
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