1. 
   Gyrotron
   Gyrotrons are high powered vacuum tubes which emit millimeter-wave beams by bunching electrons with cyclotron motion in a strong magnetic field. Output frequencies range from about 20 to 250 GHz, covering wavelengths from microwave to the edge of the terahertz gap. Typical output powers range from ...
   Found op http://en.wikipedia.org/wiki/Gyrotron
   
   
2. 
   gyrotron
   <radiobiology> A device for producing microwave energy that utilises a strong axial magnetic field in a cavity resonator to produce azimuthal bunching of an electron beam. ... (09 Oct 1997) ...
   Found op http://www.mondofacto.com/facts/dictionary?gyrotron
   
   
3. 
   gyrotron
   (from the article `electron tube`) One major type of fast-wave electron tube is the gyrotron ( figure). Sometimes called the cyclotron resonance maser, this device can generate ...
   Found op http://www.britannica.com/eb/a-z/g/86
   
   
4. 
   gyrotron
   oscillating tube used to generate high power millimetric waves in the 10 GHz - 100 GHz band
   Found op http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=815-07-32
   
   

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