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apparatus An apparatus is a piece of equipment, machine, or group of machines designed to let people do some specific thing. If you want to swim deep underwater, for example, you would probably wear an apparatus designed to let you breathe.
IV an apparatus for giving medicine or nutrients through the veins. IV is an abbreviation for intravenous.
sonar a device or apparatus used in this procedure. [1/2 definitions]
transmitter the apparatus that makes and changes radio waves in order to send them out as radio or TV signals.