n. Abnormal weakness of the muscles; but especially myasthenia gravis
The Century Dictionary and Cyclopedia
n. Muscular debility.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. 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
n. any muscular weakness
Word Usage
"The CDC report released by the New England Journal of Medicine said the Mexican toddler had a chronic muscle weakness called myasthenia gravis, a heart defect, a swallowing problem and lack of oxygen."