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secondary wave

noun
1.

S wave

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.
Also called secondary wave.
Compare L wave, P wave.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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secondary-wave in Medicine

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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secondary-wave in Science
secondary wave  
A type of seismic body wave in which rock particles vibrate at right angles to the direction of wave travel. Secondary waves cause the rocks they pass through to change in shape. These waves are the second fastest traveling seismic waves (after primary waves) and can travel through solids but not through liquids or gases. Also called shear wave, S wave. See Note at earthquake.
S wave  
See secondary wave.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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