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

canon \ca~non"\ kaumny-on"; anglicized ka^n"yu^n,
   n. sp., a tube or hollow, fr. ca~na reed, fr. l. canna.
   see cane.
   a deep gorge, ravine, or gulch, between high and steep banks,
   worn by water courses. mexico  western u. s. also spelled
   canyon.
   1913 webster +pjc
see also:
cane canyon 

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

canyon \can"yon\, n.
   the english form of the spanish word ca~non.
   1913 webster
see also:
ca~non 

[3] : WordNet (r) 2.0

canyon
     n : a ravine formed by a river in an area with little rainfall
         syn: canon
see also:
canon 

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

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

[5] : U.S. Gazetteer (1990)

canyon, mn
  zip codes: 55717
canyon, tx city, fips 12532
  location: 34.98128 n, 101.92160 w
  population 1990: 11365 4773 housing units
  area: 12.8 sq km land, 0.0 sq km water
  zip codes: 79015

Canyon >> C Words
Canyon, definition of term: Canyon
canyon_pag1.html

Grand Canyon >> G Words
Grand Canyon, definition of term: Grand Canyon
grand+canyon_pag1.html