Sudden, violent, irregular movement of the body caused by involuntary contraction of muscles and associated with brain disorders, such as epilepsy, fever in children, or with drug or alcohol abuse.
Source: PAC, 2016, 88, 713. 'Glossary of terms used in developmental and reproductive toxicology (IUPAC Recommendations 2016)' on page 739 (https://doi.org/10.1515/pac-2015-1202)