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

• undependable
• undependableness
• undependably
• undepicted
• under
• under a cloud
• under arms
• under attack
• under fire
• under it
• under that
• under the circumstances
• under the weather
• under wraps
• under-represent
• under-the-counter
• under-the-table
• underachieve
• underachievement
• underachiever
• underact
• underactive
• underage
• underarm
• underbelly