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sealing nut

noun
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Definition of sealing nut

: a nut used in making a seal specifically : a nut for sealing the terminal post of a battery at the point where the post leaves the cover of the case

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“Sealing nut.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/sealing%20nut. Accessed 10 December 2019.

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