An Etymological Dictionary of the German Language/Annotated/Luder
Luder, neuter, ‘lure, decoy, bait,’ from Middle High German luoder, neuter, ‘bait, gluttony, dissolute life, loose woman’ (from an Old Teutonic lôþra- is derived French leurre, ‘lure, bait’). Its connection with Modern High German laden is probable, since ‘bait’ is the original sense.