Vibration?
What about a vibration?
Merriam-Webster Online Dictionary
Main Entry: vi·brate
Pronunciation: 'vI-"brAt, esp British vI-'
Function: verb
Inflected Form(s): vi·brat·ed; vi·brat·ing
Etymology: Latin vibratus, past participle of vibrare to brandish, wave, rock -- more at WIPE...