rectifier vs straightener

rectifier

noun
  • Something that rectifies. 

  • The activation function f(x)= max (0,x), where x is the input to a neuron. 

  • A device that converts alternating current into direct current; often a diode. 

  • An instrument used for determining and rectifying the variations of the compass on board ship. 

straightener

noun
  • Anyone or anything which straightens. 

  • A prearranged fight to settle a dispute. 

  • A bribe. 

  • A pair of metal tongs with heated ceramic plates used for straightening hair. 

How often have the words rectifier and straightener occurred in a corpus of books? (source: Google Ngram Viewer )