convulse

v. (-sing) 1 (usu. In passive) affect with convulsions. 2 cause to laugh uncontrollably.  convulsive adj. Convulsively adv. [latin vello vuls- pull]

v. t. To contract violently and irregulary, as the muscular parts of an animal body; to shake with irregular spasms, as in excessive laughter, or in agony from grief or pain.