heterodyne

/HH EH1 T ER0 AH0 D AY0 N/
noun
  1. 1

    The beat so produced

  2. 2

    Either the sum or difference of the two oscillations

verb
  1. 1

    To produce heterodyne interference in a radio

  2. 2

    To change the frequency of a signal by such a process

adjective
  1. 1

    Of two oscillations: having two slightly different frequencies such that, when combined, they produce a beat

Source: https://en.wiktionary.org/wiki/heterodyne