myasthenia

my·as·the·ni·a  (ms-thn-)

n.

1. Abnormal muscular weakness or fatigue.

2. Myasthenia gravis.

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myas·thenic (-thnk) adj.

Thesaurus

Noun	1.	myasthenia - a chronic progressive disease characterized by chronic fatigue and muscular weakness (especially in the face and neck); caused by a deficiency of acetylcholine at the neuromuscular junctions myasthenia gravis disease of the neuromuscular junction - a disease characterized by impairment of neuromuscular junctions autoimmune disease, autoimmune disorder - any of a large group of diseases characterized by abnormal functioning of the immune system that causes your immune system to produce antibodies against your own tissues
	2.	myasthenia - any muscular weakness physical condition, physiological condition, physiological state - the condition or state of the body or bodily functions