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visible speech

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noun Phonetics.
  1. the representation in graphic or pictorial form of characteristics of speech, as by means of sound spectrograms.
  2. the system of handwritten phonetic symbols invented by Melville Bell in 1867 to provide a visually comprehensible rendition of speech sounds.
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Origin of visible speech

First recorded in 1850–55
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for visible speech

visible speech

noun
  1. a system of phonetic notation invented by Alexander Melville Bell (1819–1905) that utilized symbols based on the schematic representation of the articulations used for each speech sound
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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