- 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.
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- 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.
- See secondary wave.
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