DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   spasm
       n 1: a painful and involuntary muscular contraction [syn:
            spasm, cramp, muscle spasm]
       2: (pathology) sudden constriction of a hollow organ (as a blood
          vessel)