a person or thing that condenses.
an apparatus for condensing.
any device for reducing gases or vapors to liquid or solid form.
Optics. a lens or combination of lenses that gathers and concentrates light in a specified direction, often used to direct light onto the projection lens in a projection system.
Electricity, capacitor.

1680–90; condense + -er1

intercondenser, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
condenser (kənˈdɛnsə)
1.  a.  an apparatus for reducing gases to their liquid or solid form by the abstraction of heat
 b.  a device for abstracting heat, as in a refrigeration unit
2.  a lens that concentrates light into a small area
3.  another name for capacitor
4.  a person or device that condenses

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1680s, from condense. Given a wide variety of technical uses in late 18c. and 19c.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

condenser con·dens·er (kən-děn'sər)

  1. An apparatus for cooling a gas in order to convert it to to a liquid.

  2. An instrument for packing a material into a cavity of a tooth.

  3. The simple or compound lens on a microscope that is used to focus light on the specimen under observation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
condenser   (kən-děn'sər)  Pronunciation Key 
  1. An apparatus used to condense vapor, usually using cooling or pressurization.

  2. See capacitor.

  3. A mirror, lens, or combination of lenses used to gather light and direct it upon an object or through a projection lens.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
For example, a steam engine that has more heat applied to its boiler has more
  water forming in its condenser.
The mixture would be heated and drawn up through a condenser tube, which was
  surrounded by cold water.
The flask is rotated to prevent the liquid from violently bumping material over
  to the condenser side.
Clean the condenser coils on your refrigerator annually and check door seals to
  ensure they are airtight.
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