noun Electronics.
an electrode for the emission of secondary electrons in a vacuum tube.

1935–40; dyn(a)- + -ode2

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World English Dictionary
dynode (ˈdaɪnəʊd)
an electrode onto which a beam of electrons can fall, causing the emission of a greater number of electrons by secondary emission. They are used in photomultipliers to amplify the signal

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American Heritage
Science Dictionary
dynode   (dī'nōd')  Pronunciation Key 
An electrode used in certain electron tubes, especially photomultipliers, to provide secondary emission. Dynodes are arranged by increasing voltage between the cathode and anode of the tube, each attracting the cascade of electrons from the one behind it, and releasing more electrons to the next.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Electron accelerated to next dynode, liberates more electrons.
The average number of electrons emitted by a dynode is linearly proportional to
  the potential difference between dynodes.
The avalanche ends at the last dynode, where an electron pulse that is millions
  of times larger than it was at the beginning.
It comes complete with a photomultiplier tube, dynode chain and connecting
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