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[kloh-nuh s] /ˈkloʊ nəs/
noun, plural clonuses. Pathology.
a rapid succession of flexions and extensions of a group of muscles, usually signifying an affection of the brain or spinal cord.
Origin of clonus
1810-20; < New Latin < Greek klónos turmoil Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for clonus


a type of convulsion characterized by rapid contraction and relaxation of a muscle
Derived Forms
clonic (ˈklɒnɪk) adjective
clonicity (klɒˈnɪsɪtɪ) noun
Word Origin
C19: from New Latin, from Greek klonos turmoil
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin and History for clonus

"violent muscular spasms," 1817, from Modern Latin, from Greek klonos "turmoil, any violent motion; confusion, tumult, press of battle," from PIE *kel- "to drive, set in motion." Related: Clonic; clonicity.

Online Etymology Dictionary, © 2010 Douglas Harper
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clonus in Medicine

clonus clo·nus (klō'nəs)
n. pl. clo·nus·es
A form of movement marked by contractions and relaxations of a muscle, occurring in rapid succession, after forcible extension or flexion of a part. Also called clonospasm.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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