Etymology
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clonus (n.)

"violent muscular spasms, rapidly alternating contraction and relaxation of a muscle," 1817, from Modern Latin, from Greek klonos "turmoil, any violent motion; confusion, tumult, press of battle," a word of uncertain origin. Related: Clonicity.

updated on December 30, 2017

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Definitions of clonus from WordNet

clonus (n.)
convulsion characterized by alternating contractions and relaxations;
From wordnet.princeton.edu, not affiliated with etymonline.