the outer sole of a shoe.

1880–85; out- + sole2

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World English Dictionary
outsole (ˈaʊtˌsəʊl)
the outermost sole of a shoe

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The midsole and outsole have been pared down to two impact-absorbing pods.
It takes me a couple of weeks each spring to build up calluses on my heel and
Cushioned insole, canvas wrap under midsole and split wraparound traction
The semi-aggressive lugs on the anti slip, oil resistant outsole will hold you
  to the ground on those wet and windy urban days.
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