Basic Guidelines For English Spellings
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Each of two cavity resonators in a klystron, the first of which uses a high-frequency voltage to cause bunching of an electron beam, and the second of which uses this beam to induce a larger high-frequency voltage.
1930s; earliest use found in Science News. Irregularly from ancient Greek ῥύμβος, ῥόμβος whirling motion + -tron.