say it: SAY-dur
seder is a noun meaning "(Judaism) the ceremonial dinner on the first night (or both nights) of Passover". It carries one recorded sense.
(Judaism) the ceremonial dinner on the first night (or both nights) of Passover
Judaism
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for seder come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.