"kneecap" in the noun sense
1. patella, kneecap, kneepan
a small flat triangular bone in front of the knee that protects the knee joint
"kneecap" in the verb sense
shoot in the kneecap, often done by terrorist groups as a warning
"They kneecapped the industrialist"
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License