1) Involving the kneecap 2) Of the knee 3) Os sesamoideum 4) Sesamoid bone 
• (a.) Of or pertaining to the patella, or kneepan.
(pә-tel´әr) of or pertaining to the patella.
Pa·tel'lar adjective (Anat.) Of or pertaining to the patella, or kneepan. 
Type: Term Pronunciation: pa-tel′ăr Definitions: 1. Relating to the patella.
Patellar: Pertaining to the patella, the kneecap by another name, the familiar small bone planted in the front of the knee. Patella is a Latin word that referred to a 'small pan, dish or plate.' As a saucer, the patella is quite paltry and cannot have held much.
[adj] - near or relating to the patella or kneecap
adjective near or relating to the patella or kneecap; `patellar tendon`