The sole of the foot.

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1612.  Ainsworth, Annot. Ps. lxxxix. 52. The oracle, Gen. 3. 15. that the Serpent should bruise the foot-sole of the womans seed.

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1630.  J. Taylor (Water P.), Taylor’s Goose, Wks. 105/2.

        Or else the name of them [Soleand Geese] may well proceede
From the Dams foot-sole, whence they all do breede.

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1870.  Morris, Earthly Par., II. III. 16.

        A pain that shall not be washed out by tears;
A dreary road the weary foot-sole wears.

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