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The Collaborative International Dictionary of English v.0.48 (gcide)

kneecap \knee"cap`\, n.
1. (Anat.) A roundish, flattened, sesamoid bone in the tendon
in front of the knee joint; the patella; the kneepan.
[1913 Webster]

2. A cap or protection for the knee.


kneecap \knee"cap\ v. t.
to break the knees of, especially by shooting in the kneecap;
-- often done by criminal or terrorist groups as a warning or
punishment.

Note:

Syn: knee-cap.
[WordNet 1.5]