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; < Latindēmonstrātor, equivalent to dēmonstrā(re) (see demonstrate) + -tor-tor
Related forms
counterdemonstrator, noun
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
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."