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ondograph

[on-duh-graf, -grahf]
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noun
  1. an instrument for graphically recording oscillatory variations, as in alternating currents.
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Origin of ondograph

< French ondographe, equivalent to onde wave (< Latin unda) + -o- -o- + -graphe -graph
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for ondograph

ondograph

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
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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 Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012