myotonic

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my·o·to·ni·a

 (mī′ə-tō′nē-ə)
n.
Tonic spasm or temporary rigidity of one or more muscles, often characteristic of various muscular disorders.

my′o·ton′ic (-tŏn′ĭk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.myotonic - of or relating to or caused by myotonia