moderator

Noun
  1. Any substance used to slow down neutrons in nuclear reactors (synset 114751534)
    is a type of: inhibitor - a substance that retards or stops an activity
    subtypes: deuterium oxide, heavy water - water containing a substantial proportion of deuterium atoms, used in nuclear reactors
    is a part of: nuclear reactor, reactor - (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements
  2. In the Presbyterian church, the officer who presides over a synod or general assembly (synset 110346058)
    is a type of: presiding officer - the leader of a group meeting
  3. Someone who presides over a forum or debate (synset 110345923)
    is a type of: presiding officer - the leader of a group meeting
  4. Someone who mediates disputes and attempts to avoid violence (synset 110345753)
    is a type of: go-between, intercessor, intermediary, intermediator, mediator - a negotiator who acts as a link between parties
    subtypes: modifier - a moderator who makes less extreme or uncompromising

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