Pertaining to the sole of the foot, i.e., the surface of the foot which is 'planted' on the ground. Examples are the plantar fascia, and the plantar surfaces of the toes. Plantar flexion is a movement at the ankle which moves the foot downward, or in a plantar direction.
Found on http://www.encyclo.co.uk/local/20605
Plantar: Having to do with the sole of the foot. The plantar response (also known as the Babinski reflex) is elicited by stroking the sole. The plantar fascia is the "bowstring-like" tissue stretching from the heel beneath the sole. A plantar wart is a wart on the sole. The word "plantar" comes from the Latin "planta" ... Found on http://www.medterms.com/script/main/art.asp?articlekey=4932