[{"Bold_text": "adjective", "List Items": ["pertaining to the sense or of hearing, to sound, or to the science of sound.", "(of a building material) designed for controlling sound.", "Music.of, relating to, or being a musical instrument whose sound is not electrically enhanced or modified.arranged for or made up of such instruments:an acoustic solo; an acoustic group.", "of, relating to, or being a musical instrument whose sound is not electrically enhanced or modified.", "arranged for or made up of such instruments:an acoustic solo; an acoustic group."]}, {"Bold_text": "noun", "List Items": ["Obsolete.a remedy for deafness or imperfect hearing."]}]