any one of several species of flatfishes of the genus solea and allied genera of the family soleidae, especially the common european species (solea vulgaris), which is a valuable food fish.-any one of several american flounders somewhat resembling the true sole in form or quality, as the california sole (lepidopsetta bilineata), the long-finned sole (glyptocephalus zachirus), and other species.-the bottom of the foot; hence, also, rarely, the foot itself.-the bottom of a shoe or boot, or the piece of leather which constitutes the bottom.-the bottom or lower part of anything, or that on which anything rests in standing.-the bottom of the body of a plow; -- called also slade; also, the bottom of a furrow.-the horny substance under a horse's foot, which protects the more tender parts.-the bottom of an embrasure.-a piece of timber attached to the lower part of the rudder, to make it even with the false keel.-the seat or bottom of a mine; -- applied to horizontal veins or lodes.-to furnish with a sole; as, to sole a shoe.-being or acting without another; single; individual; only.-single; unmarried; as, a feme sole.