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