[mahy-uh s-thee-nee-uh]

noun Pathology.

muscle weakness.

Origin of myasthenia

First recorded in 1855–60; my- + asthenia
Related formsmy·as·then·ic [mahy-uh s-then-ik] /ˌmaɪ əsˈθɛn ɪk/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for myasthenia

Historical Examples of myasthenia

British Dictionary definitions for myasthenia



any muscular weakness
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.

Online Etymology Dictionary, © 2010 Douglas Harper

myasthenia in Medicine




Abnormal muscular weakness or fatigue.
Myasthenia gravis.
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.