The Collaborative International Dictionary of English v.0.48:

Enfilade \En`fi*lade"\ (?; 277), n. [F., fr. enfiler to thread,
   go trough a street or square, rake with shot; pref. en- (L.
   in) + fil thread. See File a row.]
   1. A line or straight passage, or the position of that which
      lies in a straight line. [R.]
      [1913 Webster]

   2. (Mil.) A firing in the direction of the length of a
      trench, or a line of parapet or troops, etc.; a raking
      fire.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Enfilade \En`fi*lade"\, v. t. [imp. & p. p. Enfiladed; p. pr.
   & vb. n. Enfilading.] (Mil.)
   To pierce, scour, or rake with shot in the direction of the
   length of, as a work, or a line of troops. --Campbell.
   [1913 Webster]

WordNet (r) 3.0 (2006):

enfilade
    n 1: gunfire directed along the length rather than the breadth
         of a formation [syn: enfilade, enfilade fire]
    v 1: rake or be in a position to rake with gunfire in a
         lengthwise direction