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moderator

mod·er·a·tor

moderator

 
pronunciation:
ma d reI tr
features:
Word Combinations (noun)
part of speech: noun
definition 1: someone who moderates, such as the leader of a discussion group or the chairperson at a meeting.
definition 2: a substance, such as graphite or heavy water, used in nuclear reactors to slow down neutrons, thus increasing the probability of fission.
Word CombinationsSubscriber feature About this feature
derivation: moderatorial (adj.)