A wasting away from want of nourishment; diminution in bulk or slow emaciation of the body or of any part.
- Pathology A wasting or decrease in size of a body organ, tissue, or part owing to disease, injury, or lack of use: muscular atrophy of a person affected with paralysis.
- A wasting away, deterioration, or diminution: intellectual atrophy.
- To cause to wither or deteriorate; affect with atrophy.
- To waste away; wither or deteriorate.