dem·on·stra·tor 
/ˈdɛmənˌstreɪtɚ/ noun
plural dem·on·stra·tors /ˈdɛmənˌstreɪtɚ/ noun [count] 1 : a person who is part of an event in which people gather together in order to show that they support or oppose something or someone : a person who participates in a demonstration
▪ Thousands of demonstrators marched through the streets. ▪ antiwar demonstrators 2 : a person who shows other people how something is used or done
▪ a product demonstrator
▪ Thousands of demonstrators marched through the streets. ▪ antiwar demonstrators
▪ a product demonstrator
