The Collaborative International Dictionary of English v.0.48:

Welt \Welt\, v. t. [imp. & p. p. Welted; p. pr. & vb. n.
   Welting.]
   To furnish with a welt; to sew or fasten a welt on; as, to
   welt a boot or a shoe; to welt a sleeve.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Welt \Welt\, v. t.
   To wilt. [R.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

welt \welt\ (w[e^]lt), n. [OE. welte, probably fr. W. gwald a
   hem, a welt, gwaldu to welt or to hem.]
   [1913 Webster]
   1. That which, being sewed or otherwise fastened to an edge
      or border, serves to guard, strengthen, or adorn it; as:
      (a) A small cord covered with cloth and sewed on a seam or
          border to strengthen it; an edge of cloth folded on
          itself, usually over a cord, and sewed down.
      (b) A hem, border, or fringe. [Obs.]
      (c) In shoemaking, a narrow strip of leather around a
          shoe, between the upper leather and sole.
      (d) In steam boilers and sheet-iron work, a strip riveted
          upon the edges of plates that form a butt joint.
      (e) In carpentry, a strip of wood fastened over a flush
          seam or joint, or an angle, to strengthen it.
      (f) In machine-made stockings, a strip, or flap, of which
          the heel is formed.
          [1913 Webster]

   2. (Her.) A narrow border, as of an ordinary, but not
      extending around the ends.
      [1913 Webster]

   3. A raised ridge on the surface of the skin, produced by a
      blow, as from a stick or whip; a wale; a weal; as, to
      raise welts on the back with a whip.

   Syn: wale; weal; wheal.
        [PJC]

   4. A blow that produces a welt[3].
      [PJC]

   Welt joint, a joint, as of plates, made with a welt,
      instead of by overlapping the edges. See Weld, n., 1
      (d) .
          [1913 Webster]

WordNet (r) 3.0 (2006):

welt
    n 1: a raised mark on the skin (as produced by the blow of a
         whip); characteristic of many allergic reactions [syn:
         wale, welt, weal, wheal]
    2: a raised or strengthened seam
    v 1: beat severely with a whip or rod; "The teacher often
         flogged the students"; "The children were severely
         trounced" [syn: flog, welt, whip, lather, lash,
         slash, strap, trounce]
    2: put a welt on; "welt the shoes"

Moby Thesaurus II by Grady Ward, 1.0:

196 Moby Thesaurus words for "welt":
   abscess, aposteme, bash, bat, beading, bed sore, belt, bilge,
   binding, birthmark, blackhead, blain, bleb, blemish, blister, blob,
   boil, bop, bordering, bordure, boss, bow, bubble, bubo, bulb,
   bulge, bulla, bump, bunch, bunion, burl, button, cahot, canker,
   canker sore, carbuncle, chancre, chancroid, check, chilblain,
   chine, cicatrix, clump, cold sore, comedo, condyle, convex, crack,
   crater, craze, defacement, defect, deformation, deformity,
   disfiguration, disfigurement, distortion, dowel, dress down, ear,
   edging, eschar, fault, felon, fester, festering, fever blister,
   fimbria, fimbriation, fistula, flange, flap, flaw, flax, flounce,
   freckle, frill, frilling, fringe, furbelow, furuncle, furunculus,
   gall, galloon, gathering, give a dressing-down, gnarl, gumboil,
   handle, hem, hemangioma, hemorrhoids, hickey, hide, hill, hump,
   hunch, jog, joggle, keloid, kibe, kink, knob, knot, knur, knurl,
   larrup, lather, leather, lentigo, lesion, lick, lip, list, loop,
   lump, milium, mole, motif, mountain, needle scar, nevus, nub,
   nubbin, nubble, paddle, papilloma, papula, papule, paronychia,
   parulis, peg, petechia, piles, pimple, pit, pock, pockmark, polyp,
   port-wine mark, port-wine stain, pound, pustule, rib, ridge, rift,
   ring, rising, ruffle, scab, scar, scratch, sebaceous cyst, selvage,
   shoulder, skirting, smack, smash, soft chancre, sore, spine, split,
   stigma, strawberry mark, stud, sty, style, suppuration, swelling,
   tab, tan, track, trim, trimming, tubercle, tubercule, twist, ulcer,
   ulceration, valance, verruca, vesicle, wale, wallop, warp, wart,
   weal, wen, whack, whale, wheal, whelk, whelp, whitehead, whitlow,
   wound