P wave
noun
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.
Origin of P wave
First recorded in 1935–40
Medical definitions for p wave
P wave
n.
A deflection in an electrocardiogram indicating depolarization of the atria.
Scientific definitions for p wave
P wave
See primary wave.