Echo

According to the provided mythological source material, Echo is classed as a mountain nymph in Greek mythology whose ability to speak was cursed so that she could only repeat the last words spoken to her. The supplied excerpts do not provide a fuller narrative, genealogy, cultic context, or ritual about this figure; the description in the available sources is therefore limited to her classification as a mountain nymph and the stated speech curse. Separately, the English word "echo" derives from Greek ἠχώ (ēchō) from ἦχος (ēchos) meaning "sound," establishing an etymological link between the technical term and the mythic proper name as presented in the sources.

For the acoustic phenomenon, there is no corporeal appearance: an echo is the perceptual return of sound caused by reflected sound waves; its "form" is acoustic (delay, strength) rather than visual. For the mythic Echo, the supplied sources identify her simply as a mountain nymph and do not provide physical description, clothing, or iconographic detail. Artistic or literary depictions beyond this identification are not documented in the provided material.

Acoustic echo: physically reflects sound waves so that a delayed copy of the original sound arrives at a listener; the delay is proportional to the distance to reflecting surfaces and the echo's strength may be measured relative to the direct sound. Echoes are exploited by animals (cetaceans and bats) for echolocation and by human technologies (sonar, echo sounding, ultrasonography). Mythic Echo: the only behavior recorded in the supplied mythological excerpt is the curse on her speech, leaving her able only to repeat the last words spoken to her; no further powers or behaviors are documented in the provided sources.