noun

• A device that vibrates or causes vibration.
• A vibrating device used for massage or sexual stimulation.
• (historical) A device designed to electromechanically interrupt current flowing to the step-up transformer which was used to generate the high tension positive supply in old battery-operated (automotive) valve radios.
• A trembler, as of an electric bell.
• A vibrating reed for transmitting or receiving pulsating currents in a harmonic telegraph system.
• A device for vibrating the pen of a siphon recorder to diminish frictional resistance on the paper.
• An oscillator.
• An ink-distributing roller in a printing machine, having an additional vibratory motion.
• A vibrating reed in a musical instrument, especially a reed organ.
• (weaving) Any of various vibrating devices, such as one for slackening the warp as a shed opens.
• An attachment, usually pneumatic, in a moulding machine to shake the pattern loose.