Clōn′ic, a.

a. [Fr. clonique, N. Lat. clonicus, from Gr. κλόνος, a violent, confused motion. (Med.) Having an irregular, convulsive motion. Dunglison.

Clonic spasm (Med.), that in which the muscles or muscular fibers contract and relax alternately, in quick succession, producing the appearance of agitation, as in epilepsy;—used in contradistinction to tonic spasm.