moderator

  1. Noun.  someone who moderates.
  2. Noun.  the person who presides over a synod of a Presbyterian Church.
  3. Noun.  (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.
  4. Noun.  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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This entry was last updated on RefTopia from its source on 3/20/2012.