wiper

[wahy-per]
noun
1.
a person or thing that wipes.
2.
the thing with which something is wiped, as a towel, handkerchief, or squeegee.
4.
Electricity. the portion of a selector or other similar device that makes contact with the terminals of a bank.
5.
Also, wipe. Machinery. a projection or partial cam, as on a rotating shaft, moving to lift or dislodge another part, especially so as to let it drop when released.

Origin:
1545–50; wipe + -er1

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wiper (ˈwaɪpə)
 
n
1.  any piece of cloth, such as a handkerchief, towel, etc, used for wiping
2.  a cam rotated to ease a part and allow it to fall under its own weight, as used in stamping machines, etc
3.  See windscreen wiper
4.  electrical engineering a movable conducting arm, esp one in a switching or selecting device, that makes contact with a row or ring of contacts

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
It really consists of two electric bicycles joined together side by side with a
  roof, windshield with wiper and a radio.
My major achievement recently was getting new wiper blades for my car.
With no revenue in sight, the factory shuts down before producing a single
  wiper.
Tires should be well inflated and wiper fluid should be replenished.
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