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abacus a device used for counting or calculating. An abacus has beads or other counters that slide along rods or in grooves.
accelerator a mechanical device that controls the speed of something, especially the gas pedal of a car.
altimeter a device that measures distance above the Earth's surface.
amplifier an electronic device used to make sound louder.
antenna a metal device that sends or receives radio or television signals. [1/2 definitions]
appliance a device used for a particular purpose. Stoves and refrigerators are appliances used in the home.
Aqua-Lung trademark for an underwater breathing device.
battery a device that makes electricity by using chemical reactions. Batteries are used to power many things, including cars, flashlights, toys, and watches. [1/3 definitions]
beep a short, high sound that serves as a signal. A beep is made by an electronic device or a car horn. [1/3 definitions]
binocular (usually plural) a device that uses lenses and mirrors to make objects look larger. Binoculars are used with both eyes at once.
bionic an electronic or mechanical device that replaces or helps something natural. An artificial leg is one kind of bionic device.
blowtorch a small device that makes a very hot, small flame for melting or cutting metal.
brake1 a device used to slow or stop the motion of a vehicle or machine. [1/2 definitions]
broom a device for sweeping. A broom has a bundle of straw or a brush attached to the end of a long handle.
bulb a device made of rounded glass used to create electric light. [1/3 definitions]
buzzer an electrical device that signals by buzzing.
camcorder a portable video recording device that includes a camera and a videocassette recorder in one unit.
camera a device for taking photographs. A camera is a closed box with a small hole that allows light to reach the film inside. The light makes images on the film.
can opener a device used for opening cans. Some can openers can be operated by hand while others are small electrical appliances.
cartridge a small case that holds some material or a piece of equipment. A cartridge is put into a larger device to help make it work. [1/3 definitions]
cell a device that makes electricity by chemical means. [1/4 definitions]