a combining form extracted from electron, used with nouns or combining forms, principally in the names of electron tubes (ignitron; klystron; magnetron ) and of devices for accelerating subatomic particles (cosmotron; cyclotron ); also, more generally, in the names of any kind of chamber or apparatus used in experiments (biotron ).

by initial shortening of electron, with perhaps accidental allusion to the Gk instrumental suffix -tron, as in árotron plough

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World English Dictionary
suffix forming nouns
1.  indicating a vacuum tube: magnetron
2.  indicating an instrument for accelerating atomic or subatomic particles: synchrotron
[from Greek, suffix indicating instrument]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

as a suffix in new compounds formed in physics, 1939, abstracted from electron (Gk. -tron was an instrumentive suffix).
Online Etymology Dictionary, © 2010 Douglas Harper
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