Definitions for "P Wave"
A seismic body wave which propagate like sound waves, i.e. by compression and extension in the direction of travel. They can travel through solids and liquids and are the fastest of the seismic waves.
The primary or fastest wave traveling away from a seismic event through the solid rock and consisting of a train of compressions and dilations of the material.
A deflection of the ECG corresponding to atrial depolarization.