converter

(kən vʉrtər)

noun

a person or thing that converts; specif.,
  1. a furnace for converting pig iron into steel in the Bessemer process
  2. an electrical device for converting alternating current into direct current
  3. the part of a radio receiver that changes modulated high frequencies to lower frequencies
  4. any device for adapting a radio or television receiver to added frequencies or modulations
  5. catalytic converter

See converter in American Heritage Dictionary 4

also con·ver·tor

noun
  1. One that converts, especially:
    a. A furnace in which pig iron is converted into steel by the Bessemer process.
    b. A machine that converts electric current from one kind to another.
    c. An electronic device that converts one frequency of a radio signal to another.
    d. A device that converts data from one code to another.
  2. One that is employed in converting raw products into finished products.

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