autophonoscope

== English == === Etymology === From auto- +‎ phono- +‎ -scope. === Noun === autophonoscope (plural autophonoscopes) (historical) An instrument for studying the human voice, having a lamp, a mirror, and a tube that is introduced into a person's mouth. The inner workings of the mouth can then be viewed while speaking etc. ==== Related terms ==== phonoscope