Source : Webster's Revised Unabridged Dictionary (1913)

Railing \Rail"ing\, n.
   1. A barrier made of a rail or of rails.

   2. Rails in general; also, material for making rails.

Rail \Rail\, v. t. [imp. & p. p. {Railed}; p. pr. & vb. n.
   {Railing}.]
   1. To inclose with rails or a railing.

            It ought to be fenced in and railed.  --Ayliffe.

   2. To range in a line. [Obs.]

            They were brought to London all railed in ropes,
            like a team of horses in a cart.      --Bacon.

Railing \Rail"ing\, a.
   Expressing reproach; insulting.

         Angels which are greater in power and might, bring not
         railing accusation against them.         --2 Pet. ii.
                                                  11.

Source : WordNet®

railing
     n 1: a barrier consisting of a horizontal bar and supports [syn:
          {rail}]
     2: material for making rails or rails collectively