acoustic

The word 'acoustic' originates from the Greek verb akouein, meaning 'to hear'. This verb is believed to have a deeper Proto-Indo-European root, possibly h₂keu- or h₂ḱh₂ows-, which conveyed the sense of perception or sharpness, linking hearing to a fundamental faculty of awareness. The Greek adjective akoustikos ('pertaining to hearing') was formed from this root and passed into Latin as acusticus. It entered English in the 17th century via French acoustique, initially describing the science of sound. The modern sense, relating to sound or non-amplified instruments, logically extends from this core concept of hearing and the properties of sound as perceived by the ear.

Structure: acoust (hearing) + ic (adjective suffix) acoust (from Greek akoustikos, pertaining to hearing, from akouein, to hear) + ic (English adjective-forming suffix, from Latin -icus, Greek -ikos)