from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An abnormality in neuromuscular activity characterized by rapidly alternating muscular contraction and relaxation.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. a muscular spasm with regular contractions

from the GNU version of the Collaborative International Dictionary of English

  • n. A series of muscular contractions due to sudden stretching of the muscle, -- a sign of certain neuropathies.

from The Century Dictionary and Cyclopedia

  • n. In pathology, alternating contractions and relaxations of a muscle following one another in somewhat quick succession. See clonic spasm and ankle-clonus.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. convulsion characterized by alternating contractions and relaxations


New Latin, from Greek klonos, turmoil.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin, from Greek κλονος ‘turmoil’. (Wiktionary)



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