[ ə'ku:stɪk ]
■ adjective
1》 relating to sound or hearing.
↘(of building materials) used for soundproofing or modifying sound.
↘(of a device or system) utilizing sound energy.
↘(of an explosive mine) set off by sound waves.
2》 (of popular music or musical instruments) not having electrical amplification.
■ noun
1》 the properties of a room or building that determine how sound is transmitted in it.
2》 ( ~s ) [treated as sing. ] the branch of physics concerned with the properties of sound.
Derivatives
~al adjective
~ally adverb
~ian noun
Origin
C17: from Gk akoustikos , from akouein 'hear'.