vibration

(vi-bra’shun) [L. vibra’tio, from vibra’re to shake]. 1. A rapid movement to and fro; oscillation. 2. The shaking of the body as a therapeutic measure. 3. A form of ma age. photoelectric v., a change in the position of the visual cells, and a series of photo-electric movements in the rods and cones under the influence of light.