un·​du·​la·​tor | \ -ātə-\
plural -s

Definition of undulator

1 : one that undulates a lovely blonde lady undulatorWall Street Journal
2 : a device consisting of a series of magnetic dipoles of alternating polarity into which a stream of particles (such as electrons) moving at relativistic velocity is injected to produce intense essentially monochromatic coherent synchrotron radiation at a very few wavelengths

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excited commotion or publicity

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