adj serving to stimulate.
2. stimulant ·noun that which stimulates, provokes, or excites.
3. stimulant ·adj produced increased vital action in the organism, or in any of its parts.
4. stimulant ·noun an agent which produces a temporary increase of vital activity in the organism, or in any of its parts;
sometimes used without qualification to signify an alcoholic beverage used as a stimulant.