chasm

from WordNet (r) 3.0 (2006)

chasm
    n 1: a deep opening in the earth's surface

from The Collaborative International Dictionary of English v.0.48

Chasm \Chasm\ (k[a^]z'm), n. [L. chasma, Gr. cha`sma, fr.
   chai`nein to gape, to open wide. See {Chaos}.]
   1. A deep opening made by disruption, as a breach in the
      earth or a rock; a yawning abyss; a cleft; a fissure.
      [1913 Webster]

            That deep, romantic chasm which slanted down the
            green hill.                           --Coleridge.
      [1913 Webster]

   2. A void space; a gap or break, as in ranks of men.
      [1913 Webster]

            Memory . . . fills up the chasms of thought.
                                                  --Addison.
      [1913 Webster]

from The Free On-line Dictionary of Computing (8 July 2008)

CHeap ASseMbler
CHASM

   <tool> (CHASM) A {shareware} {assembler} for {MS-DOS}.

   (1994-11-15)

from Moby Thesaurus II by Grady Ward, 1.0

115 Moby Thesaurus words for "chasm":
      abysm, abyss, aperture, arroyo, blank, box canyon, breach, break,
      broaching, canyon, cavity, chap, check, chimney, chink, clearing,
      cleavage, cleft, cleuch, clough, clove, col, coulee, couloir,
      crack, cranny, crater, crevasse, crevice, cut, cwm, deep, defile,
      dell, depth, dig, diggings, dike, disclosure, ditch, donga, draw,
      excavation, fault, fenestra, fissure, fistula, flaw, flume,
      fontanel, foramen, fracture, furrow, gap, gape, gash, gat, gorge,
      groove, gulch, gulf, gully, hiatus, hole, hollow, incision, inlet,
      interval, joint, kloof, lacuna, laying open, leak, mine, moat,
      notch, nullah, opening, opening up, orifice, outlet, overlook,
      oversight, pass, passage, passageway, pit, pore, preterition,
      quarry, ravine, rent, rift, rime, rupture, scissure, seam, shaft,
      skip, slit, slot, space, split, stoma, throwing open, trench,
      uncorking, unstopping, valley, void, wadi, well, workings, yawn,
      yawning abyss