| auscultatory percussion | Auscultation of the chest or other part at the same time that percussion is made, to aid in hearing the sound made by percussion. (05 Mar 2000) |
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| bimanual percussion | Immediate percussion in which the finger of one hand taps the other hand; a form of mediate percussion. (05 Mar 2000) |
| palpatory percussion | Finger percussion in which attention is focused upon the resistance and reverberation of the tissues under the finger as well as upon the sound elicited. Synonym: plessesthesia. (05 Mar 2000) |
| red drop effect | Experimental observation that the photosynthetic efficiency of monochromatic light is greatly reduced above 680 nm, even though chlorophyll absorbs well up to 700 nm. Led to the discovery of the two light reactions of photosynthesis. See: photosystems I and II. (18 Nov 1997) |
| mediate percussion | Percussion effected by the intervention of a finger or a plessimeter between the striking finger or plessor and the part percussed. (05 Mar 2000) |
| percussion | 1. The act of percussing, or striking one body against another; forcible collision, especially. Such as gives a sound or report. 2. Hence: The effect of violent collision; vibratory shock; impression of sound on the ear. "The thunderlike percussion of thy sounds." (Shak) 3. <medicine> The act of tapping or striking the surface of the body in order to learn the condition of the parts beneath by the sound emitted or the sensation imparted to the fingers. Percussion is said to be immediate if the blow is directly upon the body; if some interventing substance, as a pleximeter, is, used, it is called mediate. Center of percussion. See Center. Percussion bullet, a bullet containing a substance which is exploded by percussion; an explosive bullet. Percussion cap, a small copper cap or cup, containing fulminating powder, and used with a percussion lock to explode gunpowder. Percussion fuze. See Fuze. Percussion lock, the lock of a gun that is fired by percussion upon fulminating powder. Percussion match, a match which ignites by percussion. Percussion powder, powder so composed as to ignite by slight percussion; fulminating powder. Percussion sieve, Percussion table, a machine for sorting ores by agitation in running water. Origin: L. Percussio: cf. F. Percussion. See Percuss. Source: Websters Dictionary (01 Mar 1998) |
| percussion sound | Any sound elicited on percussing over one of the cavities of the body. (05 Mar 2000) |
| percussion wave | The main positive wave of an arterial pulse tracing. (05 Mar 2000) |
| clavicular percussion | Percussion, usually direct, along the entire clavicle to demonstrate dullness, particularly in apical pulmonary tuberculosis. (05 Mar 2000) |
| piano percussion | Examination for dullness by striking the chest wall directly with the fingertips of one hand successively, beginning with the fifth finger. Synonym: piano percussion. (05 Mar 2000) |
| wrist-drop | Paralysis of the extensors of the wrist and fingers; most often caused by lesion of the radial nerve. Synonym: carpoptosis, carpoptosia, drop hand. (05 Mar 2000) |
| Murphy's percussion | Examination for dullness by striking the chest wall directly with the fingertips of one hand successively, beginning with the fifth finger. Synonym: piano percussion. (05 Mar 2000) |
| hanging drop | A drop of liquid on the undersurface of the object glass for examination under the microscope. (05 Mar 2000) |
| hanging drop slide | <microscopy> A glass slide with a concavity or a built-up chamber which allows a drop of culture to be placed on a cover- slip inverted over the cell. It makes possible the examination of freely moving protozoa, etc., confined only by the limits of the drop and the bottom surface of the coverslip. (05 Aug 1998) |
| deep percussion | Heavy percussion to obtain information about deeply situated organs or structures. (05 Mar 2000) |