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

narrow \nar"row\ na^r"r-o, a. compar. narrower
   na^r"r-o~er; superl. narrowest. oe. narwe, naru,
   as. nearu; akin to os. naru, naro.
   1. of little breadth; not wide or broad; having little
      distance from side to side; as, a narrow board; a narrow
      street; a narrow hem.
      1913 webster

            hath passed in safety through the narrow seas.
                                                  --shak.
      1913 webster

   2. of little extent; very limited; circumscribed.
      1913 webster

            the jews were but a small nation, and confined to a
            narrow compass in the world.          --bp. wilkins.
      1913 webster

   3. having but a little margin; having barely sufficient
      space, time, or number, etc.; close; near5; -- with
      special reference to some peril or misfortune; as, a
      narrow shot; a narrow escape; a narrow miss; a narrow
      majority. --dryden.
      1913 webster

   4. limited as to means; straitened; pinching; as, narrow
      circumstances.
      1913 webster

   5. contracted; of limited scope; illiberal; bigoted; as, a
      narrow mind; narrow views. "a narrow understanding."
      --macaulay.
      1913 webster

   6. parsimonious; niggardly; covetous; selfish.
      1913 webster

            a very narrow and stinted charity.    --smalridge.
      1913 webster

   7. scrutinizing in detail; close; accurate; exact.
      1913 webster

            but first with narrow search i must walk round
            this garden, and no corner leave unspied. --milton.
      1913 webster

   8. phon. formed as a vowel by a close position of some
      part of the tongue in relation to the palate; or
      according to bell by a tense condition of the pharynx;
      -- distinguished from wide; as =e =eve and =oo
      f=ood, etc., from i^ i^ll and oo^ foo^t,
      etc. see guide to pronunciation, sect13.
      1913 webster

   note: narrow is not unfrequently prefixed to words,
         especially to participles and adjectives, forming
         compounds of obvious signification; as,
         narrow-bordered, narrow-brimmed, narrow-breasted,
         narrow-edged, narrow-faced, narrow-headed,
         narrow-leaved, narrow-pointed, narrow-souled,
         narrow-sphered, etc.
         1913 webster

   narrow gauge. railroad see note under gauge, n., 6.
      1913 webster
see also:
narrower narrowest narrow gauge gauge 

[2] : WordNet (r) 2.0

narrow gauge
     n : a railroad track or its width narrower than the standard
         56.5 inches

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

61 moby thesaurus words for "narrow gauge":
   angustifoliate, angustirostrate, angustisellate, angustiseptal,
   authoritarian, bigot, bigoted, borne, circumscribed, close,
   close-fitting, closed, confined, constricted, cramp, cramped,
   creedbound, crowded, deaf, deaf to reason, fanatical, hidebound,
   illiberal, incapacious, incommodious, insular, isthmian, isthmic,
   limited, little, little-minded, meager, mean, mean-minded,
   mean-spirited, narrow, narrow-hearted, narrow-minded,
   narrow-souled, narrow-spirited, near, nearsighted, parochial,
   petty, provincial, purblind, restricted, scant, scanty,
   shortsighted, slender, small, small-minded, strait, straitlaced,
   stuffy, tight, uncatholic, uncharitable, ungenerous, unliberal

Gauge >> G Words
Gauge, definition of term: Gauge
gauge_pag1.html

Narrow >> N Words
Narrow, definition of term: Narrow
narrow_pag1.html

Gauge Boson >> G Words
Gauge Boson, definition of term: Gauge Boson
gauge+boson_pag1.html

Narrow Down >> N Words
Narrow Down, definition of term: Narrow Down
narrow+down_pag1.html

Weather Gauge >> W Words
Weather Gauge, definition of term: Weather Gauge
weather+gauge_pag1.html

Rain Gauge >> R Words
Rain Gauge, definition of term: Rain Gauge
rain+gauge_pag1.html