Medical Dictionary
myasthenia gravis
noun myasthenia gra·vis \-ˈgrav-əs, -ˈgräv-\
Medical Definition of MYASTHENIA GRAVIS
: a disease characterized by progressive weakness and exhaustibility of voluntary muscles without atrophy or sensory disturbance and caused by an autoimmune attack on acetylcholine receptors at neuromuscular junctions
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