The Collaborative International Dictionary of English v.0.48:

Dell \Dell\, n. [AS. del, akin to E. dale; cf. D. delle, del,
   low ground. See Dale.]
   1. A small, retired valley; a ravine.
      [1913 Webster]

            In dells and dales, concealed from human sight.
                                                  --Tickell.
      [1913 Webster]

   2. A young woman; a wench. [Obs.]
      [1913 Webster]

            Sweet doxies and dells.               --B. Jonson.
      [1913 Webster]

WordNet (r) 3.0 (2006):

dell
    n 1: a small wooded hollow [syn: dell, dingle]

Moby Thesaurus II by Grady Ward, 1.0:

83 Moby Thesaurus words for "dell":
   abysm, abyss, arroyo, bottom, bottom glade, bottoms, box canyon,
   breach, break, canyon, cavity, chap, chasm, check, chimney, chink,
   cleft, cleuch, clough, col, coulee, couloir, crack, cranny,
   crevasse, crevice, cut, cwm, dale, defile, dike, dingle, ditch,
   donga, draw, excavation, fault, fissure, flaw, flume, fracture,
   furrow, gap, gape, gash, gill, glen, gorge, groove, grove, gulch,
   gulf, gully, hole, incision, intervale, joint, kloof, leak,
   lunar rill, moat, notch, nullah, opening, pass, passage, ravine,
   rent, rift, rime, rupture, scissure, seam, slit, slot, split,
   strath, trench, trough, vale, valley, void, wadi



U.S. Gazetteer Places (2000):

Dell, AR -- U.S. town in Arkansas
   Population (2000):    251
   Housing Units (2000): 121
   Land area (2000):     0.888456 sq. miles (2.301091 sq. km)
   Water area (2000):    0.000000 sq. miles (0.000000 sq. km)
   Total area (2000):    0.888456 sq. miles (2.301091 sq. km)
   FIPS code:            18160
   Located within:       Arkansas (AR), FIPS 05
   Location:             35.856818 N, 90.040113 W
   ZIP Codes (1990):     72426
   Note: some ZIP codes may be omitted esp. for suburbs.
   Headwords:
    Dell, AR
    Dell