transitron

noun
tran·​si·​tron | \ ˈtran(t)sə‧ˌträn, -nzə-\
plural -s

Definition of transitron

: a pentode operating under conditions where the transconductance of the tube is negative and permits the tube to be used in oscillator, trigger, or similar circuits

History and Etymology for transitron

perhaps from transition + -tron

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