paroxysmal

from WordNet (r) 3.0 (2006)

paroxysmal
    adj 1: accompanied by or of the nature of paroxysms

from The Collaborative International Dictionary of English v.0.48

Paroxysmal \Par`ox*ys"mal\, a.
   Of the nature of a paroxysm; characterized or accompanied by
   paroxysms; as, a paroxysmal pain; paroxysmal temper. --
   {Par`ox*ys"mal*ly}, adv.
   [1913 Webster]