|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
|a chattering or flighty, light-headed person.|
|—vb (often foll by with)|
|1.||(tr) to shake or agitate violently|
|2.||(tr) to cause (muscles) to undergo violent spasms or contractions|
|3.||informal to shake or be overcome (with violent emotion, esp laughter)|
|4.||(tr) to disrupt the normal running of (a country, etc): student riots have convulsed India|
|[C17: from Latin convulsus, from convellere to tear up, from vellere to pluck, pull]|
convulsive con·vul·sive (kən-vŭl'sĭv)
Characterized by or having the nature of convulsions.
Having or producing convulsions.