The Collaborative International Dictionary of English v.0.48:
Padder \Pad"der\, n. 1. One who, or that which, pads. [1913 Webster] 2. A highwayman; a footpad. [Obs.] [1913 Webster]WordNet (r) 3.0 (2006):
padder n 1: a highwayman who robs on foot [syn: footpad, padder]