au·di·o·spectrograph | \¦ȯdē(ˌ)ō +\
plural -s

Definition of audiospectrograph 

: an instrument that measures sound and records the measurement on a record sheet

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First Known Use of audiospectrograph

1953, in the meaning defined above

History and Etymology for audiospectrograph

audio- + spectrograph

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The first known use of audiospectrograph was in 1953

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