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A device used to deaden some of the noise from a firearm, although not to the same extent as a suppressor or silencer.
(UK) An examiner at Oxford and Cambridge universities.
1792, Anthony à Wood, The History and Antiquities of the University of Oxford: In Two Books, volume 1, Oxford: John Gutch, →OCLC, page 661:
One hall called Civil Law Hall or School, flouriſhed about this time (though in its buildings decayed) by the care of the learned and judicious Dr. Will. Warham Principal or Moderator thereof […]
(engineering) a substance (often water or graphite) used to decrease the speed of fast neutrons in a nuclear reactor and hence increase likelihood of fission
“moderator”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
moderator in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
moderator in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.