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1. Any substance used to slow down neutrons in nuclear reactors
    
2. In the Presbyterian church, the officer who presides over a synod or general assembly
    
3. Someone who presides over a forum or debate
    
4. Someone who mediates disputes and attempts to avoid violence

Derived forms: moderators

See also: moderate, moderatorship

Type of: go-between, inhibitor, intercessor, intermediary, intermediator, mediator, presiding officer

Part of: nuclear reactor, reactor

Encyclopedia: Moderator