Noun
- plural form of Penning trap
penning-traps
English Wiktionary. Available under CC-BY-SA license.
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"penning-traps." YourDictionary, n.d. Web. 24 March 2019. <https://www.yourdictionary.com/penning-traps>.
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penning-traps. (n.d.). Retrieved March 24th, 2019, from https://www.yourdictionary.com/penning-traps
