The Collaborative International Dictionary of English v.0.48:

Dimple \Dim"ple\, n. [Prob. a nasalized dim. of dip. See Dip,
   and cf. Dimble.]
   1. A slight natural depression or indentation on the surface
      of some part of the body, esp. on the cheek or chin.
      --Milton.
      [1913 Webster]

            The dimple of her chin.               --Prior.
      [1913 Webster]

   2. A slight indentation on any surface.
      [1913 Webster]

            The garden pool's dark surface . . .
            Breaks into dimples small and bright. --Wordsworth.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dimple \Dim"ple\, v. i. [imp. & p. p. Dimpled; p. pr. & vb. n.
   Dimpling.]
   To form dimples; to sink into depressions or little
   inequalities.
   [1913 Webster]

         And smiling eddies dimpled on the main.  --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Dimple \Dim"ple\, v. t.
   To mark with dimples or dimplelike depressions. --Shak.
   [1913 Webster]

WordNet (r) 3.0 (2006):

dimple
    n 1: a chad that has been punched or dimpled but all four
         corners are still attached [syn: dimpled chad, pregnant
         chad, dimple]
    2: any slight depression in a surface; "there are approximately
       336 dimples on a golf ball"
    3: a small natural hollow in the cheek or chin; "His dimple
       appeared whenever he smiled"
    v 1: mark with, or as if with, dimples; "drops dimpled the
         smooth stream"
    2: produce dimples while smiling; "The child dimpled up to the
       adults"

Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "dimple":
   alveolation, alveolus, cockle, dent, depress, dint, engrave, fret,
   furrow, gouge, honeycomb, impress, impression, imprint, indent,
   indentation, indention, indenture, notch, pit, pock, pockmark,
   press in, print, punch, punch in, recess, riffle, set back, set in,
   stamp, sunken part, tamp