Webster's English Dictionary

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atrophy

1. at.ro.phy \'a-tr*-fe-\ n [LL atrophia, fr. Gk, fr. atrophos ill fed, fr. 
   a- + treph]ein to nourish; akin to Gk thrombos clot, curd : decrease in 
   size or wasting away of a body part or tissue; also :: arrested development 
   or loss of a part or organ incidental to the normal development or life of 
   an animal or plant
2. atrophy vb : to undergo atrophy  : to cause to undergo atrophy