You searched for:
“acousticon”
An instrument for helping the hearing impaired to hear: The school children who were visiting their local museum saw a hundred-year-old acousticon which was shaped like a trumpet and was to be held close to a person's ear to enable the user to hear.
This entry is located in the following unit:
acous-, acou-, acouo-, acoustico-, acouto-, acousti-, -acousia, -acousis, -acoustical, acu-, -acusis-, -acusia
(page 3)