• synonyms


  1. a person or thing that expands.
  2. Also ex·pan·dor. Electronics. a transducer that produces an output with a range of voltages greater than that of the input signal.Compare compressor(def 5).
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Origin of expander

First recorded in 1860–65; expand + -er1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for expander

Historical Examples of expander

  • Then turn the expander a quarter round, and drive in the pin again.

    Farm Engines and How to Run Them

    James H. Stephenson

  • The air does not pass the expander until after it has gone through the boiler already mentioned.

  • Finally remove the expander, and use the calking tool to bead the end.

  • Then force the expander into the leaky flue, bringing the shoulder well up against the end of the flue.

  • Loosen up and continue till you have turned the expander entirely around.

British Dictionary definitions for expander


  1. a device for exercising and developing the muscles of the bodya chest expander
  2. an electronic device for increasing the variations in signal amplitude in a transmission system according to a specified lawCompare compressor (def. 5), compander
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012