We're working on a new site. Click here to get a sneak preview.
Medical Dictionary


noun plan·tar·is \plan-ˈtar-əs\
plural plan·tar·es \-ˌēz\

Medical Definition of PLANTARIS

:  a small muscle of the calf of the leg that arises from the lower end of the femur and the posterior ligament of the knee joint, is inserted with the Achilles tendon by a very long slender tendon into the calcaneus, and weakly flexes the leg at the knee and the foot at the ankle—see plantar interosseus, verruca plantaris

Illustration of PLANTARIS

How to use a word that (literally) drives some people nuts.
Test your vocab with our fun, fast game
Ailurophobia, and 9 other unusual fears