One who takes part in a demonstration; a protester.
The forefinger.
One who demonstrates anything, or proves beyond doubt.
An item, particularly a vehicle, used in demonstrations to a customer or user.
An assistant to a lecturer.
One who demonstrates products in a retail environment; a merchandiser.
One who teaches anatomy from the dissected parts.
A sit-in, a protest of civil disobedience by people sitting and refusing to move.
An act of sitting down, especially with other people in some form of social exchange.
Intended to be done, used, consumed etc. while sitting.