The bottom part of the feet: The new shoes were very comfortable for Linda's plantars.

In anatomy, of or relating to the soles or undersurfaces of the feet: Gerald had some kind of plantar disease that made it very difficult for him to wear shoes and even to walk.

A reaction to a touch on the soles or base of the feet that results in the movements of the toes: Plantar reflexes include a stroking or tender rubbing of the outer surfaces of the bottoms of the feet resulting in an automatic instinctive reaction to the stimuli.

Painful lesions or damaged skin areas on the undersurface of the feet primarily at points of pressure: Such areas of pain can be caused by plantar warts that are recognized by very small black spots or hard, horny, rough-surfaced areas on the lower sides of the feet.

Plantar warts are often acquired by walking bare-footed on contaminated floors near swimming pools and communal showers.

As a result of pressure from the weight of the body, plantar warts are flattened and forced into the skin on the base of the feet; often causing discomfort or even pain when a person is standing or walking.