| moderator | | |
| n. (substance) | 1. moderator | any substance used to slow down neutrons in nuclear reactors. |
| ~ 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. |
| ~ inhibitor | a substance that retards or stops an activity. |
| ~ deuterium oxide, heavy water | water containing a substantial proportion of deuterium atoms, used in nuclear reactors. |
| n. (person) | 2. moderator | in the Presbyterian church, the officer who presides over a synod or general assembly. |
| ~ presiding officer | the leader of a group meeting. |
| n. (person) | 3. moderator | someone who presides over a forum or debate. |
| ~ presiding officer | the leader of a group meeting. |
| n. (person) | 4. moderator | someone who mediates disputes and attempts to avoid violence. |
| ~ go-between, intercessor, intermediary, intermediator, mediator | a negotiator who acts as a link between parties. |
| ~ modifier | a moderator who makes less extreme or uncompromising. |
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