n. One who or that which oscillates.n. One of the Oscillatoria.n. In machinery, any oscillating machine or part of a machine, as the oscillating shuttle of a sewing-machine, or the mechanism by which a power-hammer is vibrated or tilted.n. A motor in which the piston oscillates in the cylinder over a minute range at high speed. In combination with a dynamo it is used to obtain currents of high frequency.n. In wireless telegraphy, that part of the transmitting apparatus which produces the electric waves or oscillations. See wireless telegraphy.