| y | Greek letter psi; wave function |
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| PSW | primary surgical ward; positive sharp wave; psychiatric social worker |
| PWV | pulse wave velocity |
| QMI | Q-wave myocardial infarction |
| Q-T | in electrocardiography, the time from the beginning of the QRS complex to the end of the T wave [int... |
| longitudinal wave | <physics> Waves where the variation of the field is partially or totally in the direction of propagation (parallel to wavennumber, k [a vector]). Examples include sound waves and Langmuir waves. Contrasted with transverse waves, where the variation is perpendicular to the direction of propagation, such as light waves. (13 Nov 1997) |
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