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myotonia

[mahy-uh-toh-nee-uh]
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noun Pathology.
  1. tonic muscle spasm or muscular rigidity.

Origin of myotonia

First recorded in 1895–1900; myo- + -tonia
Related formsmy·o·ton·ic [mahy-uh-ton-ik] /ˌmaɪ əˈtɒn ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for myotonia

myotonia

noun
  1. lack of muscle tone, frequently including muscle spasm or rigidityAlso called: amyotonia
Derived Formsmyotonic (ˌmaɪəˈtɒnɪk), adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

myotonia in Medicine

myotonia

(mī′ə-tōnē-ə)
n.
  1. Delayed relaxation of a muscle after an initial contraction.
Related formsmy′o•tonic (-tŏnĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.