n. The underside of a shoe, which makes contact with the floor.
the GNU version of the Collaborative International Dictionary of English
n. The outside sole of a boot or shoe.
The Century Dictionary and Cyclopedia
n. The outer sole of a boot or shoe, which bears upon the ground when in use. Between the in-sole and the out-sole the margin of the upper is fitted and attached to both these soles by stitching or pegging.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. the outer sole of a shoe or boot that is the bottom of the shoe and makes contact with the ground
Word Usage
"The uppers feature breathable, quick drying leather and mess stitched directly to the midsole, and the outsole is a non-marking "Omni-Grip" rubber compound with traction control to prevent slipping on slick surfaces."