demonstrator

Plural: demonstrators

Noun

• a teacher or teacher's assistant who demonstrates the principles that are being taught
• someone who demonstrates an article to a prospective buyer
• someone who participates in a public display of group feeling
• One who demonstrates anything, or proves beyond doubt.
• The forefinger.
• One who takes part in a demonstration; a protester.
• One who demonstrates products in a retail environment; a merchandiser.
• An item, particularly a vehicle, used in demonstrations to a customer or user.
• An assistant to a lecturer.
• One who teaches anatomy from the dissected parts.

Synonyms

protester, sales demonstrator, index finger