sole

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various chiefly marine flatfishes of the family Soleidae, having both eyes on the right side of the body, and including food fishes such as the Dover sole of the Atlantic Ocean.
• noun Any of various other flatfishes, especially certain flounders.
• noun The underside of the foot.
• noun The underside of a shoe or boot, often excluding the heel.
• noun The part on which something else rests while in a vertical position, especially.
• noun The bottom surface of a plow.
• noun The bottom surface of the head of a golf club.
• transitive verb To furnish (a shoe or boot) with a sole.
• transitive verb To put the sole of (a golf club) on the ground, as in preparing to make a stroke.
• adjective Being the only one.
• adjective Of or relating to only one individual or group; exclusive.

from The Century Dictionary.

• To furnish with a sole, as a shoe or boot; put a new sole on. Compare half-sole, v. t.
• noun In ichthyology, a flatfish of the family Solcidæ, and especially of the genus Solea; a soleid or sole-fish.
• Alone; by itself; singly.
• noun The bottom or under side of the foot; technically, the planta, corresponding to the palm of the hand.
• noun The foot.
• noun That part of a shoe or boot which comes under the sole of the foot, and upon which the wearer treads.
• noun The part of anything that forms the bottom, and on which it stands upon the ground; the bottom or lower part of anything.
• noun A flat surface like the sole of the foot.
• noun A wooden band or yoke put around the neck of an ox or a cow in a stall.
• noun A pond.
• noun Same as sol.
• To pull by the ears; pull about; haul; lug.
• noun In golf, the flat, bottom part of a club which rests on the ground.
• noun The inner cylindrical surface of a water-wheel which forms the bottoms of the buckets on the periphery. See sole-plate, 2.
• In golf, to place the sole of (a club) on the ground immediately behind the ball in preparing for a shot.
• noun A name given to various Australian fishes: in Sydney to Synaptura nigra; in Melbourne to Rhombosolea bassensis; in New Zealand to Rhombosolea monopus (called the flounder in Tasmania) and Peltorhamphus novæ-zelandiæ; and in Tasmania to Ammotretis restrains, of the family Pleuronectidæ.
• Only; alone in its kind; being or acting without another; single; unique; individual: as, God is the sole creator and sovereign of the world.
• Alone; unaccompanied; solitary.
• Mere.
• In law, single; unmarried; not having a spouse: as, a feme sole. See feme.

from the GNU version of the Collaborative International Dictionary of English.

• transitive verb To furnish with a sole.
• adjective Being or acting without another; single; individual; only.
• adjective (Law) Single; unmarried.
• adjective See the Note under Corporation.
• noun Any one of several species of flatfishes of the genus Solea and allied genera of the family Soleidæ, especially the common European species (Solea vulgaris), which is a valuable food fish.
• noun 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.
• noun (Zoöl.) a European species of sole (Solea pegusa).
• noun (Zoöl.) the megrim.
• noun The bottom of the foot; hence, also, rarely, the foot itself.
• noun The bottom of a shoe or boot, or the piece of leather which constitutes the bottom.
• noun The bottom or lower part of anything, or that on which anything rests in standing.
• noun (Agric.) The bottom of the body of a plow; -- called also slade; also, the bottom of a furrow.
• noun (Far.) The horny substance under a horse's foot, which protects the more tender parts.
• noun (Fort.) The bottom of an embrasure.
• noun (Naut.) A piece of timber attached to the lower part of the rudder, to make it even with the false keel.
• noun (Mining) The seat or bottom of a mine; -- applied to horizontal veins or lodes.