counterdemonstrator

demonstrator

[dem-uhn-strey-ter]
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:
1605–15; < Latin dēmonstrātor, equivalent to dēmonstrā(re) (see demonstrate) + -tor -tor

counterdemonstrator, noun
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World English Dictionary
demonstrator (ˈdɛmənˌstreɪtə)
 
n
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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