Sole (foot)
The sole is the bottom of the foot.
In humans the sole of the foot is anatomically referred to as the plantar aspect. The equivalent surface in ungulates is the hoof.
Read more about Sole (foot): Human Anatomy, In Other Animals, See Also
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“Truth exists. The sole purpose of this proposition is to assert the existence of truth against imbeciles and sceptics.”
—Edward Herbert Of Cherbury, Lord (1583–1648)