D defs.my
Entry 2 senses Webster, 1913

Rectifier

/(r?k"t?*f?`?r)/ · Rec·ti·fi·er · IPA /ˈɹɛktɪfaɪɚ/
01 n. One who, or that which, rectifies.
  1. 1.
    One who, or that which, rectifies.
  2. 2.
    Specifically: (a) (Naut.) An instrument used for determining and rectifying the variations of the compass on board ship. (b) (Chem.) A rectificator.(Naut.)