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delta wave

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noun Physiology.
  1. any of the slow brain waves constituting delta rhythm.
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Origin of delta wave

First recorded in 1935–40
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
delta wave in Medicine

delta wave

n.
  1. A slurring of the R-wave upstroke in an electrocardiogram as seen in Wolff-Parkinson-White syndrome.
  2. delta rhythm
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.