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myasthenia

American

[mahy-uhs-thee-nee-uh] / ˌmaɪ əsˈθi ni ə /

noun

Pathology.

muscle weakness.

myasthenia British

/ ˌmaɪəsˈθiːnɪə /

noun

any muscular weakness
short for myasthenia gravis

"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

Other Word Forms

myasthenic

adjective

Etymology

Origin of myasthenia

First recorded in 1855–60; my- + asthenia

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

myasthenia

Germinal center cells also play an important role in certain autoimmune diseases, including rheumatoid arthritis and myasthenia gravis.

From Science Daily ● Oct. 8, 2026

The firm helped build, for example, a tool that screens for a rare neuromuscular disorder called myasthenia gravis.

From The Wall Street Journal ● Aug. 15, 2026

Nine-time Grand Slam champion Monica Seles has revealed she was diagnosed with myasthenia gravis - a neuromuscular autoimmune disease - three years ago.

From BBC ● Aug. 13, 2025

His longtime partner, Keely Stahl, said the cause was myasthenia gravis, an autoimmune neuromuscular disease that weakens the skeletal muscles.

From New York Times ● Jan. 27, 2023

Esophageal paralysis is not uncommon in myasthenia gravis.

From Bronchoscopy and Esophagoscopy A Manual of Peroral Endoscopy and Laryngeal Surgery by Chevalier Jackson

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Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023