omnigraph

[ om-ni-graf, -grahf ]
/ ˈɒm nɪˌgræf, -ˌgrɑf /

noun

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. 2020