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demonstrator

[dem-uh n-strey-ter] /ˈdɛm ənˌstreɪ tər/
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.
Origin
1605-1615
1605-15; < Latin dēmonstrātor, equivalent to dēmonstrā(re) (see demonstrate) + -tor -tor
Related forms
counterdemonstrator, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for demonstrator
  • He catches four cops manhandling a student demonstrator but also others who let children play in their car.
  • The demonstrator called the pastor, who was sleeping next door.
British Dictionary definitions for demonstrator

demonstrator

/ˈdɛmənˌstreɪtə/
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
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
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Word Origin and History for 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."

Online Etymology Dictionary, © 2010 Douglas Harper
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