| NOUN | phenomenon | delta rhythm, delta wave | the normal brainwave in the encephalogram of a person in deep dreamless sleep |
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| Meaning | The normal brainwave in the encephalogram of a person in deep dreamless sleep; occurs with high voltage and low frequency (1 to 4 hertz). | |
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| Synonym | delta wave | |
| Broader | brainwave, brain wave, cortical potential | (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph |
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