acoustic(n = noun.artifact) - a remedy for hearing loss or deafness;
is a kind of curative, cure, remedy, therapeutic
Derived form adjective acoustic₁

   acoustic(a = adj.pert) acoustical - of or relating to the science of acoustics; "acoustic properties of a hall"
Derived forms noun acoustic₁, noun acoustics₁

   Pertaining to the sense of hearing, the organs of hearing, or the science of sounds; auditory. [1913 Webster]

   A medicine or agent to assist hearing. [1913 Webster]

acoustic, adj. & n.
--adj.
1 relating to sound or the sense of hearing.
2 (of a musical instrument, gramophone, or recording) not having electrical amplification (acoustic guitar).
3 (of building materials) used for soundproofing or modifying sound.
4 Mil. (of a mine) that can be exploded by sound waves transmitted under water.
--n.
1 (usu. in pl.) the properties or qualities (esp. of a room or hall etc.) in transmitting sound (good acoustics; a poor acoustic).
2 (in pl.; usu. treated as sing.) the science of sound (acoustics is not widely taught).

Idiom:
acoustic coupler Computing a modem which converts digital signals into audible signals and vice versa, so that the former can be transmitted and received over telephone lines.

Derivative:
acoustical adj. acoustically adv.

Etymology:
Gk akoustikos f. akouo hear

N  hearing, audition, auscultation, eavesdropping, audibility, acute ear, nice ear, delicate ear, quick ear, sharp ear, correct ear, musical ear, ear for music, ear, auricle, lug, acoustic organs, auditory apparatus, eardrum, tympanum, tympanic membrane, ear trumpet, speaking trumpet, hearing aid, stethoscope, earshot, hearing distance, hearing, hearing range, sound, carrying distance, telephone, phone, telephone booth, intercom, house phone, radiotelephone, radiophone, wireless, wireless telephone, mobile telephone, car radio, police radio, two-way radio, walkie-talkie, handie-talkie, citizen's band, CB, amateur radio, ham radio, short-wave radio, police band, ship-to-shore radio, airplane radio, control tower communication, (communication), electronic devices, phonograph, gramophone, megaphone, phonorganon, microphone, directional microphone, mike, hand mike, lapel microphone, phonograph needle, stylus, diamond stylus, pickup, reading head (electronic devices), hearer, auditor, listener, eavesdropper, listener-in, auditory, audience, otology, otorhinolaryngology, otologist, otorhinolaryngologist, hearing, auditory, auricular, acoustic, phonic, arrectis auribus, Int, hark, hark ye!, hear!, list, listen!, O yes!, Oyez!, listen up, listen here!, hear ye!, attention!, achtung.

acoustic aphasia, acoustic buoy, acoustic delay line, acoustic device, acoustic gramophone, acoustic guitar, acoustic impedance, acoustic meatus, acoustic modem, acoustic nerve, acoustic phenomenon, acoustic power, acoustic projection, acoustic radiation pressure, acoustic reactance, acoustic resistance, acoustic spectrum, acoustic storage, acoustic wave, ship-towed long-range acoustic detection system