Webster's English Dictionary

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patella

Cross references:
  1. kneecap               
 
pa.tel.la \p*-'tel-*\ \-'tel-(.)e-, -.i-\ \-'tel-*r\ n or pa.tel.lae or 
   patellas [L, fr. dim. of patina shallow dish] pl  : a thick flat triangular 
   movable bone that forms the anterior point of th e knee and protects the 
   front of the joint - pa.tel.lar aj