Ἠχώ

In Ovid's Metamorphoses, written around 8 CE, the nymph Echo was punished by Hera for one specific crime: talking too much. Echo had distracted Hera with long conversations while Zeus conducted his affairs with other nymphs. When Hera discovered the trick, she cursed Echo to never speak first again—only to repeat the last words spoken by others.

The tragedy deepened when Echo fell in love with Narcissus. She followed him through the forest, unable to declare her feelings, able only to mirror his words back to him. When Narcissus called out 'Is anyone here?' she could only answer 'Here... here.' He rejected her, and she wasted away until nothing remained but her voice, repeating forever in caves and mountains.

The Greeks had already used ēkhō (ἠχώ) to mean a reflected sound before Ovid wrote his version. Homer used the word in the Odyssey. But Ovid's retelling fused the acoustic phenomenon with a story of loss so completely that the two became inseparable. The myth did not create the word; it colonized it.

Modern acoustics inherited the term without the grief. An echo is measured in milliseconds, calculated by distance and surface hardness. Sonar, radar, and medical ultrasound all depend on echoes. The word has been reused in technology—Amazon's Echo device, echocardiograms, echo chambers in political discourse. A nymph's punishment became a principle of physics, then a product name.