mordacity

from WordNet (r) 3.0 (2006)

mordacity
    n 1: a disposition to biting

from The Collaborative International Dictionary of English v.0.48

Mordacity \Mor*dac"i*ty\, n. [L. mordacitas: cf. F.
   mordacit['e]. See {Mordacious}.]
   The quality of being mordacious; biting severity, or
   sarcastic quality. --Bacon.
   [1913 Webster]