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myasthenia
my·as·the·ni·a [ m əss thnee ə ] or my·as·the·ni·a gra·vis [ m əs thnee ə grviss ]


noun 
Definition:
 
extreme muscle weakness: an autoimmune disease involving extreme weakness of some muscles, caused by the blocking of the receptors for acetylcholine, the neurotransmitter that causes muscular contraction

my·as·then·ic [ m əss thénnik ] adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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