Source : Webster's Revised Unabridged Dictionary (1913)

Piquant \Pi"quant\, a. [F., p. pr. of piquer to prick or sting.
   See {Pike}.]
   Stimulating to the taste; giving zest; tart; sharp; pungent;
   as, a piquant anecdote. ``As piquant to the tongue as salt.''
   --Addison. ``Piquant railleries.'' --Gov. of Tongue.

Source : WordNet®

piquant
     adj 1: having an agreeably pungent taste [syn: {savory}, {savoury},
             {spicy}, {zesty}]
     2: engagingly stimulating or provocative; "a piquant wit";
        "salty language" [syn: {salty}]
     3: attracting or delighting; "an engaging frankness"; "a
        piquant face with large appealing eyes" [syn: {engaging}]