The Collaborative International Dictionary of English v.0.48:

Sol \Sol\ Sole \Sole\, n. [From hydrosol an aqueous colloidal
   solution, confused with G. sole, soole, salt water from which
   salt is obtained.] (Chem.)
   A fluid mixture of a colloid and a liquid; a liquid colloidal
   solution or suspension.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Sole \Sole\ (s[=o]l), n. [AS. sole, fr. L. soolea (or rather an
   assumed L. sola), akin to solumround, soil, sole of the foot.
   Cf. Exile, Saloon, Soil earth, Sole the fish.]
   1. The bottom of the foot; hence, also, rarely, the foot
      itself.
      [1913 Webster]

            The dove found no rest for the sole of her foot.
                                                  --Gen. viii.
                                                  9.
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            Hast wandered through the world now long a day,
            Yet ceasest not thy weary soles to lead. --Spenser.
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   2. The bottom of a shoe or boot, or the piece of leather
      which constitutes the bottom.
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            The "caliga" was a military shoe, with a very thick
            sole, tied above the instep.          --Arbuthnot.
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   3. The bottom or lower part of anything, or that on which
      anything rests in standing. Specifially:
      (a) (Agric.) The bottom of the body of a plow; -- called
          also slade; also, the bottom of a furrow.
      (b) (Far.) The horny substance under a horse's foot, which
          protects the more tender parts.
      (c) (Fort.) The bottom of an embrasure.
      (d) (Naut.) A piece of timber attached to the lower part
          of the rudder, to make it even with the false keel.
          --Totten.
      (e) (Mining) The seat or bottom of a mine; -- applied to
          horizontal veins or lodes.
          [1913 Webster]

   Sole leather, thick, strong, used for making the soles of
      boots and shoes, and for other purposes.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sole \Sole\, n. [F. sole, L. solea; -- so named from its flat
   shape. See Sole of the foot.] (Zool.)
   (a) 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.
   (b) 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.
       [1913 Webster]

   Lemon, or French, sole (Zool.), a European species of
      sole (Solea pegusa).

   Smooth sole (Zool.), the megrim.
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The Collaborative International Dictionary of English v.0.48:

Sole \Sole\, v. t. [imp. & p. p. Soled; p. pr. & vb. n.
   Soling.]
   To furnish with a sole; as, to sole a shoe.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Sole \Sole\, a. [L. solus, or OF. sol, F. seul (fr. L. solus;
   cf. L. sollus whole, entire. Cf. Desolate, Solemn,
   Solo, Sullen.]
   1. Being or acting without another; single; individual; only.
      "The sole son of my queen." --Shak.
      [1913 Webster]

            He, be sure . . . first and last will reign
            Sole king.                            --Milton.
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   2. (Law) Single; unmarried; as, a feme sole.
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   Corporation sole. See the Note under Corporation.
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   Syn: Single; individual; only; alone; solitary.
        [1913 Webster]

WordNet (r) 3.0 (2006):

sole
    adj 1: not divided or shared with others; "they have exclusive
           use of the machine"; "sole rights of publication" [syn:
           exclusive, sole(a)]
    2: being the only one; single and isolated from others; "the
       lone doctor in the entire county"; "a lonesome pine"; "an
       only child"; "the sole heir"; "the sole example"; "a solitary
       instance of cowardice"; "a solitary speck in the sky" [syn:
       lone(a), lonesome(a), only(a), sole(a),
       solitary(a)]
    n 1: the underside of footwear or a golf club
    2: lean flesh of any of several flatfish [syn: sole, fillet
       of sole]
    3: the underside of the foot
    4: right-eyed flatfish; many are valued as food; most common in
       warm seas especially European
    v 1: put a new sole on; "sole the shoes" [syn: sole, resole]