n. pl. Se·ders or Se·dar·im (sĭ-därĭm, sĕ-dä-rĭm)
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.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.