1. (noun) 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

• als
• lou gehrig's disease

1. (noun) 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

• induration
• sclerosis
• nervous disorder
• neurological disease
• neurological disorder