#maser  Microwave Amplification by Stimulated Emission of Radiation; amplifier that works on same principle as a laser and emits coherent microwave radiation
  supertype:  #amplifier  electronic equipment that increases strength of signals passing through it
  subtype:  #gas_maser__gasmaser  a maser in which microwave radiation interacts with gas molecules

No statement uses or specializes #maser; click here to add one.