1941, in the meaning defined above
International Scientific Vocabulary
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Beta Ursae Majoris
Cite this Entry
“Betatron.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/betatron. Accessed 29 Nov. 2021.
More from Merriam-Webster on betatron
Britannica.com: Encyclopedia article about betatron
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