demonstrator

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dem·on·stra·tor / ˈdemənˌstrātər/ • n. 1. a person who takes part in a public protest meeting or march.2. a person who shows how a particular piece of equipment works or how a skill or craft is performed. ∎  a person who teaches in this way, esp. in a laboratory. ∎  a piece of merchandise that can be tested by potential buyers.