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P wave

a longitudinal earthquake wave that travels through the interior of the earth and is usually the first conspicuous wave to be recorded by a seismograph.
Also called primary wave.
Compare L wave, S wave.
1935-40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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P wave in Medicine

P wave n.
A deflection in an electrocardiogram indicating depolarization of the atria.

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