tonoscope

noun

1. Any of various devices that make sound visible by displaying vibrations.

   When the tonoscope was used with patients suffering from speech difficulties, the difference between a pure sound and a skewed sound was clearly evident.

Where it comes from

From tono- + -scope, coined by Dr. Hans Jenny, who invented the first such device and published research that was based on it.

Adapted from the Wiktionary entry tonoscope (CC BY-SA 4.0).

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