| DDU | dermo-distortive urticaria; duplex Doppler ultrasound |
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| DEFIANT | Doppler Flow and Echocardiography in Functional Cardiac Insufficiency Assessment of Nisoldipine Ther... |
| DS | dead air space; dead space; deep sedative; deep sleep; defined substrate; dehydroepiandrosterone sul... |
| DSCF | Doppler-shifted constant frequency |
| DTI | dipyridamole-thallium imaging; Doppler tissue imaging |
| 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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