From The Collaborative International Dictionary of English v.0.48 [gcide]:
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.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
piquant
adj 1: having an agreeably pungent taste [syn: piquant,
savory, savoury, spicy, zesty]
2: engagingly stimulating or provocative; "a piquant wit";
"salty language" [syn: piquant, salty]
3: attracting or delighting; "an engaging frankness"; "a piquant
face with large appealing eyes" [syn: engaging, piquant]