Pronunciation: (hä'sid; Ashk. Heb. khô'sid; Seph.Heb. khä-sēd'),[key] —n., —pl.Ha•sid•imPronunciation: (hä-sid'im, hu-; Ashk. Heb. khô-sē'dim; Seph.Heb. khä-sē-dēm').[key]Judaism. 1. a member of a sect founded in Poland in the 18th century by Baal Shem-Tov and characterized by its emphasis on mysticism, prayer, ritual strictness, religious zeal, and joy. Cf. Mitnagged. 2. an Assidean. Also,Hassid,Chasid,Chassid.