piquancy

from WordNet (r) 3.0 (2006)

piquancy
    n 1: a tart spicy quality [syn: {nip}, {piquance}, {piquancy},
         {piquantness}, {tang}, {tanginess}, {zest}]
    2: the quality of being agreeably stimulating or mentally
       exciting [syn: {piquancy}, {piquance}, {piquantness}]

from The Collaborative International Dictionary of English v.0.48

Piquancy \Pi"quan*cy\, n. [See {Piquant}.]
   The quality or state of being piquant.
   [1913 Webster]