noun
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
足底の痛みは歩行に影響する。
Pain in the sole of the foot affects walking.
足底のアーチが崩れると、疲れやすくなる。
When the arch of the foot collapses, you get tired more easily.