• synonyms


[mahy-uh s-thee-nee-uh]
noun Pathology.
  1. muscle weakness.
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Origin of myasthenia

First recorded in 1855–60; my- + asthenia
Related formsmy·as·then·ic [mahy-uh s-then-ik] /ˌmaɪ əsˈθɛn ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for myasthenia

Historical Examples of myasthenia

  • He compares it to certain forms of cardiac dilatation—both expressions of myasthenia.

    A System of Practical Medicine By American Authors, Vol. II


British Dictionary definitions for myasthenia


  1. any muscular weakness
  2. short for myasthenia gravis
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Derived Formsmyasthenic (ˌmaɪəsˈθɛnɪk), adjective

Word Origin for myasthenia

C19: from myo- + asthenia
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

Word Origin and History for myasthenia


"muscular weakness," 1856, medical Latin; see myo- + asthenia.

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Online Etymology Dictionary, © 2010 Douglas Harper

myasthenia in Medicine


  1. Abnormal muscular weakness or fatigue.
  2. Myasthenia gravis.
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Related formsmy′as•thenic (-thĕnĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.