demonstrator

[ dem-uh n-strey-ter ]
/ ˈdɛm ənˌstreɪ tər /

noun

a person or thing that demonstrates.
Also demonstrant. a person who takes part in a public demonstration, as by marching or picketing.
a person who explains orteaches by practical demonstrations.
a person who exhibits the use and application of (a product, service, etc.) to a prospective customer.
the product, device, machine, etc., actually used in demonstrations to purchasers or prospective customers: They sold the demonstrator at half price.

Origin of demonstrator

1605–15; < Latin dēmonstrātor, equivalent to dēmonstrā(re) (see demonstrate) + -tor -tor

Related forms

coun·ter·dem·on·stra·tor, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for demonstrators

British Dictionary definitions for demonstrators

demonstrator

/ (ˈdɛmənˌstreɪtə) /

noun

a person who demonstrates equipment, machines, products, etc
a person who takes part in a public demonstration
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