definition of
atrophy

[1] #1 atrophy n. [wasting, wasting away] a decrease in size of an organ caused by disease or disuse. wn

[2] #2 atrophy v. undergo atrophy; "Muscles that are not used will atrophy". wn

[3] #3 atrophy n. [withering] any weakening or degeneration (especially through lack of use). wn