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ondograph

[on-duh-graf, -grahf] /ˈɒn dəˌgræf, -ˌgrɑf/
noun
1.
an instrument for graphically recording oscillatory variations, as in alternating currents.
Origin
< French ondographe, equivalent to onde wave (< Latin unda) + -o- -o- + -graphe -graph
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for ondograph

ondograph

/ˈɒndəʊˌɡrɑːf; -ˌɡræf/
noun
1.
an instrument for producing a graphical recording of an alternating current by measuring the charge imparted to a capacitor at different points in the cycle
Word Origin
C20: from French, from onde wave + -graph
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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