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P wave

noun
1.
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.
Origin
1935-1940
1935-40
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Word Origin and History for p waves

p wave

n.

1908 in geology, the p representing primary (adj.).

Online Etymology Dictionary, © 2010 Douglas Harper
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p waves 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 waves 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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