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omnigraph

[om-ni-graf, -grahf]
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noun
  1. a device for converting Morse Code signals that are punched on a tape into audio signals, used in the training of telegraph operators.
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Origin of omnigraph

First recorded in 1860–65; omni- + -graph
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018