s waves

S wave

noun Geology.
a transverse earthquake wave that travels through the interior of the earth and is usually the second conspicuous wave to reach a seismograph.
Also called secondary wave.
Compare L wave, P wave.
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American Heritage
Medical Dictionary

S wave n.
A downward deflection of the QRS complex in an electrocardiogram following an R wave.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
S wave  
See secondary wave.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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