Vis·i·ble speech. Phon. A system of characters invented by Prof. Alexander Melville Bell to represent all sounds that may be uttered by the speech organs, and intended to be suggestive of the position of the organs of speech in uttering them.
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visible speech
n 1: a phonetic alphabet invented by Melville Bell in the 19th
century
2: spectrogram of speech; speech displayed spectrographically