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autophonoscope

From Wiktionary, the free dictionary

English

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Etymology

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From auto- +‎ phono- +‎ -scope.

Noun

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autophonoscope (plural autophonoscopes)

  1. (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.
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