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* someone who moderates
* an arbitrator or mediator
* the chair or president of a meeting etc
* the person who presides over a synod of a Presbyterian Church
* (physics) a substance (often water or graphite) used to decrease the speed of fast neutrons in a nuclear reactor and hence increase likelihood of fission
* a device used to deaden some of the noise from a firearm, although not to the same extent as a suppressor or silencer.
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