Source : WordNet®

kneecap
     n : a small flat triangular bone in front of the knee that
         protects the knee joint [syn: {patella}, {kneepan}]
     v : shoot in the kneecap, often done by terrorist groups as a
         warning
     [also: {kneecapping}, {kneecapped}]

kneecapping
     See {kneecap}