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.
1908 in geology, the p representing primary (adj.).
P wave n.
A deflection in an electrocardiogram indicating depolarization of the atria.
See primary wave.
Pension and Welfare Benefits Administration
1. . National Organization of Physicians Who Care
1. Public Works Department. person with disability
1. Public Works Department.