Se·der 
(sādər)
(sādər)n. pl. Se·ders or Se·dar·im (sĭ-därĭm, sĕ-dä-rĭm)
Judaism
Judaism
A ritual feast commemorating the exodus of the Jews from Egypt, held on the first night or first two nights of Passover.
[Hebrew sēder, order, arrangement, Seder; see sdr in the Appendix of Semitic roots.]