sole of the foot; planta
Anatomical term for the underside of the foot. In everyday language, 足の裏 is more common.
See also: 足の裏
Pain in the sole of the foot affects walking.
When the arch of the foot collapses, you get tired more easily.
plantar reflex
plantar wart
plantar fasciitis
Compound of 足 (foot) and 底 (bottom, sole). The reading そくてい uses the on'yomi of both kanji, typical for technical anatomical terms.