Wiktionary
n. a toothbrush that uses electric power, usually supplied by a battery, to move the brush head rapidly
WordNet
n. a toothbrush with an electric motor in the handle that vibrates the head of the brush
Wikipedia
An electric toothbrush is a toothbrush that makes rapid, automatic bristle motions, either back-and-forth oscillation or rotation-oscillation (where the brush head alternates clockwise and counterclockwise rotation), in order to clean teeth. Motions at sonic speeds or below are made by a motor. In the case of ultrasonic toothbrushes, ultrasonic motions are produced by a piezoelectric crystal. A modern electric toothbrush is usually powered by a rechargeable battery charged through inductive charging when the brush sits in the charging base between uses.
Electric toothbrushes can be classified according to the frequency (speed) of their movements as power, sonic or ultrasonic toothbrushes, depending on whether they make movements that are below, in or above the audible range (20–20,000 Hz or 2400–2,400,000 movements per minute), respectively.
Usage examples of "electric toothbrush".
Glass shelves on one side of the washbasin supported Hermione's array of lotions and unguents, her shampoos, perfumes, cotton wool buds, tweezers, and electric toothbrush.
I shaved, sprayed on some deodorant, ferreted some food particles out of my teeth with dental floss, then sandblasted with the electric toothbrush and gargled with mouth wash.
Having spent a lifetime working with machines, I know very well that mankind hasn't yet succeeded in building one that won't break down, whether it's an electric toothbrush or a Rolls-Royce car.
It looked like a cross between an oversized ballpoint pen and an electric toothbrush.
It looked like an electric toothbrush with an electrode where the bristles would be.
Toni came out of the bathroom with the electric toothbrush in her mouth.
Since when did sheets with the right thread-count, a coffee maker, and an electric toothbrush become the only things worth having or working toward?
Gardenia's son had charged them for the rug and the vanity, where they had got the night-table lamps, exactly how old Rosemary was, and if an electric toothbrush was really any better than the old kind.
She unplugs the electric toothbrush, connects the Mac's power cord, then plugs herself in.
I was starting to have romantic thoughts about my electric toothbrush.