[1] : The Collaborative International Dictionary of English v.0.48

gulf \gulf\ gu^lf, n. f. golfe, it. golfo, fr. gr. ko`lpos
   bosom, bay, gulf, lgr. ko`lfos.
   1. a hollow place in the earth; an abyss; a deep chasm or
      basin,
      1913 webster

            he then surveyed
            hell and the gulf between.            --milton.
      1913 webster

            between us and you there is a great gulf fixed.
                                                  --luke xvi.
                                                  26.
      1913 webster

   2. that which swallows; the gullet. obs. --shak.
      1913 webster

   3. that which swallows irretrievably; a whirlpool; a sucking
      eddy. --shak.
      1913 webster

            a gulf of ruin, swallowing gold.      --tennyson.
      1913 webster

   4. geog. a portion of an ocean or sea extending into the
      land; a partially land-locked sea; as, the gulf of mexico.
      1913 webster

   5. mining a large deposit of ore in a lode.
      1913 webster

   gulf stream geog., the warm ocean current of the north
      atlantic.

   note: it originates in the westward equatorial current, due
         to the trade winds, is deflected northward by cape st.
         roque through the gulf of mexico, and flows parallel to
         the coast of north america, turning eastward off the
         island of nantucket. its average rate of flow is said
         to be about two miles an hour. the similar japan
         current, or kuro-siwo, is sometimes called the gulf
         stream of the pacific.

   gulf weed bot., a branching seaweed sargassum
      bacciferum, or sea grape, having numerous berrylike air
      vessels, -- found in the gulf stream, in the sargasso sea,
      and elsewhere.
      1913 webster
see also:
gulf stream gulf weed sargassum bacciferum 

[2] : WordNet (r) 2.0

gulf
     n 1: an arm of a sea or ocean partly enclosed by land; larger
          than a bay
     2: an unbridgeable disparity as from a failure of
        understanding; "he felt a gulf between himself and his
        former friends"; "there is a vast disconnect between
        public opinion and federal policy" syn: disconnect, disconnection
     3: a deep wide chasm
see also:
disconnect disconnection 

[3] : Moby Thesaurus II by Grady Ward, 1.0

163 moby thesaurus words for "gulf":
   charybdis, maelstrom, abysm, abyss, aperture, arm, armlet, arroyo,
   back stream, backflow, backwash, backwater, bay, bayou, belt,
   bight, boca, box canyon, breach, break, broaching, canyon, cave,
   cavity, chap, chasm, check, chimney, chink, clearing, cleft,
   cleuch, clough, col, coulee, couloir, countercurrent, counterflow,
   counterflux, cove, crack, cranny, crater, creek, crevasse, crevice,
   cut, cwm, deep, defile, dell, depth, dig, diggings, dike,
   disclosure, ditch, donga, draw, eddy, estuary, euripus, excavation,
   fault, fenestra, fiord, firth, fissure, fistula, fjord, flaw,
   flume, fontanel, foramen, fracture, frith, furrow, gap, gape, gash,
   gat, gorge, groove, gulch, gully, gurge, gut, harbor, hiatus, hole,
   hollow, incision, inlet, interval, joint, kloof, kyle, lacuna,
   laying open, leak, loch, lough, maelstrom, mine, moat, mouth,
   narrow, narrow seas, narrows, natural harbor, notch, nullah,
   opening, opening up, orifice, outlet, pass, passage, passageway,
   pit, pore, quarry, ravine, reach, refluence, reflux, regurgitation,
   rent, rift, rime, road, roads, roadstead, rupture, scissure, seam,
   separation, shaft, slit, slot, slough, sound, space, split, stoma,
   strait, straits, swirl, throwing open, trench, twirl, uncorking,
   unstopping, valley, void, vortex, wadi, well, whirl, whirlpool,
   workings, yawn, yawning abyss

[4] : U.S. Gazetteer Counties (2000)

gulf -- u.s. county in florida
   population 2000:    13332
   housing units 2000: 7587
   land area 2000:     554.597338 sq. miles 1436.400451 sq. km
   water area 2000:    189.996686 sq. miles 492.089137 sq. km
   total area 2000:    744.594024 sq. miles 1928.489588 sq. km
   located within:       florida fl, fips 12
   location:             29.940016 n, 85.267756 w
   headwords:
    gulf
    gulf, fl
    gulf county
    gulf county, fl

Gulf >> G Words
Gulf, definition of term: Gulf
gulf_pag1.html

Gulf Stream >> G Words
Gulf Stream, definition of term: Gulf Stream
gulf+stream_pag1.html

Persian Gulf >> P Words
Persian Gulf, definition of term: Persian Gulf
persian+gulf_pag1.html

Persian Gulf Wa >> P Words
Persian Gulf Wa, definition of term: Persian Gulf Wa
persian+gulf+wa_pag1.html

Gulf Of Mexico >> G Words
Gulf Of Mexico, definition of term: Gulf Of Mexico
gulf+of+mexico_pag1.html