Adjective
Having an irregular, convulsive motion.
Source: Webster's dictionaryclonic spasm Source: Internet
A cry may be heard due to contraction of the chest muscles, followed by a shaking of the limbs in unison (clonic phase). Source: Internet
He discovered that the epileptic patients often made the same clonic and tonic movements of muscle during their seizures, leading Jackson to believe that they must be occurring in the same place every time. Source: Internet