Source : Webster's Revised Unabridged Dictionary (1913)

Stimulant \Stim"u*lant\, a. [L. stimulans, p. pr.; cf. F.
   stimulant. See {Stimulate}.]
   1. Serving to stimulate.

   2. (Physiol.) Produced increased vital action in the
      organism, or in any of its parts.

Stimulant \Stim"u*lant\, n. [Cf. F. stimulant.]
   1. That which stimulates, provokes, or excites.

            His feelings had been exasperated by the constant
            application of stimulants.            --Macaulay.

   2. (Physiol. & Med.) 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.

Source : WordNet®

stimulant
     adj : that stimulates; "stimulant phenomena" [syn: {stimulating}]

stimulant
     n 1: any stimulating information or event; acts to arouse action
          [syn: {stimulation}, {stimulus}, {input}]
     2: a drug that temporarily quickens some vital process [syn: {stimulant
        drug}]