Origin and Etymology of clonus
New Latin, from Greek klonos agitation — more at hold
First Known Use: 1817
Medical Definition of clonus
: a series of alternating contractions and partial relaxations of a muscle that in some diseases of the central nervous sytem occurs in the form of convulsive spasms involving complex groups of muscles and is believed to result from alteration of the normal pattern of motor neuron discharge—compare tonus 2
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