rectifier

[rek-tuh-fahy-er]
noun
1.
a person or thing that rectifies.
2.
Electricity. an apparatus in which current flows more readily in one direction than the other, for changing an alternating current into a direct current.
3.
the apparatus that in distillation separates the most volatile material by condensing it; condenser.

Origin:
1605–15; rectify + -er1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
rectifier (ˈrɛktɪˌfaɪə)
 
n
1.  an electronic device, such as a semiconductor diode or valve, that converts an alternating current to a direct current by suppression or inversion of alternate half cycles
2.  chem an apparatus for condensing a hot vapour to a liquid in distillation; condenser
3.  a thing or person that rectifies

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
rectifier  [%PREMIUM_LINK%]     (rěk'tə-fī'ər)  Pronunciation Key 
An electrical device that converts alternating current to direct current. Rectifiers are most often made of a combination of diodes, which allow current to pass in one direction only. Compare converter, transformer.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

rectifier

device that converts alternating electric current into direct current. It may be an electron tube (either a vacuum or a gaseous type), vibrator, solid-state device, or mechanical device. Direct current is necessary for the operation of many devices such as radio and television receivers and certain power tools.

Learn more about rectifier with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The usual way to do this would be to use a rectifier-a device that converts alternating to direct current.
At the time of the inspection, the operator had not conducted any rectifier inspections.
The alternator is connected to a battery bank via rectifier.
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