Source : Webster's Revised Unabridged Dictionary (1913)

Defilading \De`fi*lad"ing\, n. (Mil.)
   The art or act of determining the directions and heights of
   the lines of rampart with reference to the protection of the
   interior from exposure to an enemy's fire from any point
   within range, or from any works which may be erected.
   --Farrow.

Defilade \De`fi*lade"\, v. t. [imp. & p. p. {Defiladed}; p. pr.
   & vb. n. {Defilading}.] [Cf. F. d['e]filer to defile, and
   d['e]filade act of defiling. See 1st {Defile}.] (Mil.)
   To raise, as a rampart, so as to shelter interior works
   commanded from some higher point.