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Webster 1913 Edition

Adj.

[Gr.

κλόνοσ

a violent, confused motion; cf. F.

clonique

(Med.)

Having an irregular, convulsive motion.

Dunglison.

Clonic spasm

(Med.)

See under

Adj.

Shaking; convulsive; irregular; as clonic spasm.

clonic ‎(comparative more clonic, superlative most clonic)

Pertaining to clonus; having irregular, convulsive spasms.
- 1973: Hospital attendants stand by to drag the children off, drooling, screaming, having clonic convulsions. — Thomas Pynchon, Gravity's Rainbow

having irregular, convulsive spasms