in general, denotes anything that relates to the ear, or the sense of hearing.

ACOUSTIC duct, in anatomy, the same with meatus auditorius, or the external passage of the ear. See Anatomy, Part VI.

ACOUSTIC instrument, an instrument made in the form of a horn, perforated at the small end, to assist hearing.

ACOUSTIC nerve, the same with the auditory nerve. See Anatomy, Part V. and Auditory nerve.