vastus lateralis
noun
vastus lat·er·a·lis
| \ -ˌlat-ər-ˈā-ləs
, -ˈal-əs
\
, -ˈal-əs
\
Medical Definition of vastus lateralis
: the division of the quadriceps muscle that covers the outer anterior aspect of the femur, arises chiefly from the femur, and inserts into the outer border of the patella by a flat tendon which blends with that of the other divisions of the muscle and sends an expansion to the capsule of the knee
— called also vastus externus