Als \Als\, adv. 1. Also. [Obs.] --Chaucer. 2. As. [Obs.] --Chaucer.
ALS 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 [syn: {amyotrophic lateral sclerosis}, {Lou Gehrig's disease}]