Rotula

·noun The patella, or kneepan.

rotula
rŏtŭla, ae, f. (collat. form rŏtŭlus, i, m., Calp. Ecl. 7, 50), dim. [rota], a little wheel , Plaut...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.