Abd-el-Kader, ahbd'el kah'dur, (1807-1873), a famous Arab chief. He distinguished himself by his determined resistance to the French arms in North Africa. In 1835 he was strong enough to inflict a signal defeat on General Trezel, but the French gradually obtained the mastery. Abd-el-Kader was sent to Toulon and was liberated by Louis Napoleon in 1852.