
A weakening, shrinking, and loss of muscle caused by disease or lack of use. Muscle wasting decreases strength and the ability to move.
Found on
http://www.cancer.gov/dictionary?expand=M

The loss of muscle, perhaps as a result of lack of use. As the muscle becomes smaller, it also becomes weaker.
Found on
http://www.encyclo.co.uk/local/20560

also known as muscle atrophy, is a decrease in the mass of the muscle; it can be a partial or complete wasting away of muscle. When a muscle atrophies, it becomes weaker, since the ability to exert force is related to mass.
Found on
http://www.encyclo.co.uk/local/21811

the degeneration of a muscle (loss of bulk), caused by disease or starvation
Found on
https://www.encyclo.co.uk/local/20875
No exact match found.