succussāˈtion noun

1. A shaking up, violent shaking
2. The trotting of a horse (obsolete)

succussion /-ushˈən/ noun

1. An act or instance of shaking
2. A method of diagnosis in which a patient is shaken to detect the presence of an abnormal quantity of fluid in a body cavity, eg the pleural cavity (medicine)
3. The splashing sound made by such fluid when the patient moves suddenly or is deliberately shaken

succussˈive adjective