1. (Judaism) the ceremonial dinner on the first night (or both nights) of Passover
   - Seder

Type of: supper

• Operation Desert Storm
• operational
• operational casualty
• operational cell
• operational damage
• operationalism
• operationalist
• operationally
• operations
• operations research
• operative
• operative field
• operatively
• operator
• operator gene
• opercular
• operculate
• operculated
• operculum
• operetta
• operon
• operose
• operoseness
• Opheodrys
• Opheodrys aestivus