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junk ring

noun
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Definition of junk ring

: a wide ring around the piston of an internal-combustion engine forming the base for piston rings

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History and Etymology for junk ring

junk entry 1; from its originally use in confining the hemp packing round the piston of a steam engine

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“Junk ring.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/junk%20ring. Accessed 19 Feb. 2020.

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