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S wave

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noun Geology.
  1. a transverse earthquake wave that travels through the interior of the earth and is usually the second conspicuous wave to reach a seismograph.
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Compare L wave, P wave.
Also called secondary wave.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

swave in Medicine

S wave

n.
  1. A downward deflection of the QRS complex in an electrocardiogram following an R wave.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

swave in Science

S wave

  1. See secondary wave.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.