from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A chronic, progressive disease marked by gradual degeneration of the nerve cells in the central nervous system that control voluntary muscle movement. The disorder causes muscle weakness and atrophy and usually results in death. Also called Lou Gehrig's disease.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A chronic, progressive disease characterized by degeneration of the central nervous system and the loss of voluntary muscle control.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. thickening of tissue in the motor tracts of the lateral columns and anterior horns of the spinal cord; results in progressive muscle atrophy that starts in the limbs
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