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Pronunciation varies by accent · noun
(physics) A periodic structure of dipole magnets that generates a low-energy collimated beam of radiation..
Use undulator when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Undulator means (physics) A periodic structure of dipole magnets that generates a low-energy collimated beam of radiation..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use undulator where its definition matches the intended context.
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