|delta rhythm or delta wave|
|physiol See also brain wave the normal electrical activity of the cerebral cortex during deep sleep, occurring at a frequency of 1 to 4 hertz and detectable with an electroencephalograph|
|delta wave or delta wave|
delta wave n.
A slurring of the R-wave upstroke in an electrocardiogram as seen in Wolff-Parkinson-White syndrome.
See delta rhythm.