The Collaborative International Dictionary of English v.0.48:

Footpad \Foot"pad`\, n.
   A highwayman or robber on foot.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

pad \pad\ (p[a^]d), n. [D. pad. [root]21. See Path.]
   1. A footpath; a road. [Obs. or Prov. Eng.]
      [1913 Webster]

   2. An easy-paced horse; a padnag. --Addison
      [1913 Webster]

            An abbot on an ambling pad.           --Tennyson.
      [1913 Webster]

   3. A robber that infests the road on foot; a highwayman; --
      usually called a footpad. --Gay. --Byron.
      [1913 Webster]

   4. The act of robbing on the highway. [Obs.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

footpad
    n 1: a highwayman who robs on foot [syn: footpad, padder]