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demonstrator

[dem-uh n-strey-ter]
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noun
  1. a person or thing that demonstrates.
  2. Also demonstrant. a person who takes part in a public demonstration, as by marching or picketing.
  3. a person who explains orteaches by practical demonstrations.
  4. a person who exhibits the use and application of (a product, service, etc.) to a prospective customer.
  5. the product, device, machine, etc., actually used in demonstrations to purchasers or prospective customers: They sold the demonstrator at half price.
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Origin of demonstrator

1605–15; < Latin dēmonstrātor, equivalent to dēmonstrā(re) (see demonstrate) + -tor -tor
Related formscoun·ter·dem·on·stra·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for demonstrators

demonstrator

noun
  1. a person who demonstrates equipment, machines, products, etc
  2. a person who takes part in a public demonstration
  3. a piece of merchandise, such as a car that one test-drives, used to display merits or performance to prospective buyers
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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

Word Origin and History for demonstrators

demonstrator

n.

1610s, "one who points out," agent noun in Latin form from demonstrate. From 1680s as "one who uses exhibits as a method of teaching;" 1870 as "one who participates in public demonstrations."

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Online Etymology Dictionary, © 2010 Douglas Harper