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myasthenia gravis myasthenia gravÂ·is (grÄv'Ä­s) n. A disease characterized by progressive fatigue and generalized weakness of the skeletal muscles, especially those of the face, neck, arms, and legs, caused by impaired transmission of nerve impulses following an autoimmune attack on acetylcholine receptors. Also called Goldflam disease.
What is myasthenia gravis? The term âmyasthenia gravisâ (MG) comes from the Greek word âmyastheniaâ meaning muscle weakness and the Latin word âgravisâ meaning severe. It is an autoimmune condition which causes problems with the transmission of signals from the nerves to the muscles.