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submain

noun
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sub·​main

Definition of submain

: a main (as in a sewer, gas, electrical, or drainage system) having a number of lesser mains feeding into or branching from it but being itself subsidiary to a larger main

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History and Etymology for submain

sub- + main

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“Submain.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/submain. Accessed 24 Feb. 2021.

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