• (n.) See Demonstrator.
Dem'on·stra`ter noun See Demonstrator . 
demonstrator, demonstrater 1. Someone who demonstrates, such as a participant in a public display of opinion. 2. A person who demonstrates an article to a prospective buyer. 3. A teacher or teacher's assistant who demonstrates the principles that are being taught or studied; such as, by dissection, experiment, or chemical preparation. 4. Someone...