The Collaborative International Dictionary of English v.0.48:

Arrow \Ar"row\, n. [OE. arewe, AS. arewe, earh; akin to Icel.
   ["o]r, ["o]rvar, Goth. arhwazna, and perh. L. arcus bow. Cf.
   Arc.]
   A missile weapon of offense, slender, pointed, and usually
   feathered and barbed, to be shot from a bow.
   [1913 Webster]

   Broad arrow.
   (a) An arrow with a broad head.
   (b) A mark placed upon British ordnance and government
       stores, which bears a rude resemblance to a broad
       arrowhead.
       [1913 Webster]

WordNet (r) 3.0 (2006):

arrow
    n 1: a mark to indicate a direction or relation [syn: arrow,
         pointer]
    2: a projectile with a straight thin shaft and an arrowhead on
       one end and stabilizing vanes on the other; intended to be
       shot from a bow

Moby Thesaurus II by Grady Ward, 1.0:

62 Moby Thesaurus words for "arrow":
   antelope, arrowhead, barb, blaze, blue darter, blue streak,
   bobtailed arrow, bolt, cannonball, chested arrow, cloth yard shaft,
   compass needle, courser, dart, direction, direction post, eagle,
   electricity, express train, finger post, fist, flash, flight,
   gazelle, greased lightning, greyhound, guide, guideboard,
   guidepost, hand, hare, hour hand, index, index finger, jet plane,
   lead, light, lightning, lubber line, mercury, milepost,
   minute hand, needle, pointer, quarrel, quicksilver, reed, rocket,
   scared rabbit, shaft, shot, signboard, signpost, streak,
   streak of lightning, striped snake, swallow, thought, thunderbolt,
   torrent, volley, wind