The Collaborative International Dictionary of English v.0.48:

Freckle \Freck"le\ (fr[e^]k"k'l), n. [Dim., from the same root
   as freak, v. t.]
   1. A small yellowish or brownish spot in the skin,
      particularly on the face, neck, or hands.
      [1913 Webster]

   2. Any small spot or discoloration.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Freckle \Frec"kle\, v. t. [imp. & p. p. Freckled
   (fr[e^]k"k'ld); p. pr. & vb. n. Freckling
   (fr[e^]k"kl[i^]ng).]
   To sprinkle or mark with freckles or small discolored spots;
   to spot.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Freckle \Frec"kle\ (fr[e^]k"k'l), v. i.
   To become covered or marked with freckles; to be spotted.
   [1913 Webster]

WordNet (r) 3.0 (2006):

freckle
    n 1: a small brownish spot (of the pigment melanin) on the skin
         [syn: freckle, lentigo]
    v 1: become freckled; "I freckle easily"
    2: mark with freckles

Moby Thesaurus II by Grady Ward, 1.0:

177 Moby Thesaurus words for "freckle":
   band, bar, bespangle, bespeckle, bespot, birthmark, blackhead,
   blaze, blaze a trail, bleb, blemish, blister, blot, blotch, brand,
   bulla, caste mark, chalk, chalk up, check, check off, checker,
   checkmark, cicatrix, cicatrize, comedo, crack, crater, craze, cut,
   dapple, dappledness, dappleness, dash, defacement, defect, define,
   deformation, deformity, delimit, demarcate, discolor,
   discoloration, disfiguration, disfigurement, distortion, dot,
   dottedness, earmark, engrave, engraving, fault, flake, flaw, fleck,
   flick, flyspeck, freckliness, gash, graving, hack, harlequin,
   hatch, hemangioma, hickey, impress, imprint, iris, jot, keloid,
   kink, lentigo, line, macula, maculate, maculation, macule,
   make a mark, marble, marbleize, mark, mark off, mark out, marking,
   milium, mole, motley, mottle, mottledness, needle scar, nevus,
   nick, notch, patch, pencil, pepper, pimple, pit, pock, pockmark,
   point, pointillage, pointillism, polka dot, polychrome,
   polychromize, port-wine mark, port-wine stain, prick, print, punch,
   punctuate, puncture, pustule, rainbow, riddle, rift, scab, scar,
   scarification, scarify, score, scotch, scratch, scratching, seal,
   seam, sebaceous cyst, spangle, spatter, speck, speckle,
   speckliness, splash, splatter, split, splotch, spot, spottedness,
   spottiness, sprinkle, stain, stamp, stigma, stigmatize, stipple,
   stippledness, stippling, strawberry mark, streak, striate, stripe,
   stud, sty, tattoo, tattoo mark, tessellate, tick, tick off, tittle,
   trace, track, twist, underline, underscore, variegate, vein,
   verruca, vesicle, wale, warp, wart, watermark, weal, welt, wen,
   whitehead